Stack Overflow might be the greatest receptacles of human knowledge on programming.
But I would argue that it usefulness only extends to its body of knowledge. As a service and/or community it has been pretty terrible for a long time:
If you were a new user trying to learn programming, it was maybe one of the most toxic resources available. I don't think I have posted a question since 2019. And even there, the only thing the average user could expect was a snippy response from someone who barely stopped to read your post. And/or a mod deletion because a similar-ish question already existed (regardless of whether it had a satisfying answer).
At a certain point, all the meaningful questions have already been asked. The site exists to collect novel new problems and not help people with iterations on existing problems.
(Also, underrated is the extent that the industry has homogenized around a couple of frameworks that are used for everything. I think it's telling that the peak of StackOverflow coincided with the era that React was taking off, to just name one).
Early years SO was optimized for people helping people. Later on they ruined the site by optimizing for tidiness ... and griefing users (especially new ones) off the site in the process.
They actual had the eternal September problem, which they were always going to hit, but managed to stave it off for a decade or so before it became overwhelming.
From your perspective as a question asker, the community was too strict. From the unpaid volunteers perspective, they were drowning in dupes.
Eternal September was never a problem for SO, it was an asset. Duplicate questions was never a problem for those asking or answering questions (I did both), only for a relatively small group of loudmouthed moderators. Now they hardly have any dupes to worry about but they also have no content to moderate!
The reason that duplicates were treated as dangerous was that SO viewed their most important user not as anyone you have mentioned but instead they prized the lurker most- the person who typed their problem into Google and got brought to SO, and never asked or answered a question because they got what they wanted from that one page load. The entire structure of SO was built around this user.
So why does that mean that duplicates are dangerous? Because of updates. When someone answered a question about how to do something in Python (but it was 2008 so it was written in Python2) SO had ways to get a more correct, up-to-date answer to that question written in 2015 (and then again in 2019) and get that upvoted, and moderators could reward that new answer by editing the original etc.
That is why duplicates were a major threat: if the same question is asked and answered thousands of times, no one is going to go do the work to update all of those answers all across the site. Those lurkers are now dependent on the whims of Google as to which of the many answers you get taken to, and whether it has the latest answer or some answer that stopped working years ago.
And that is why they were so hostile to duplicate questions.
To extend this, the eventual problem is that you eventually lose all of your new users, which means you lose the extremely valuable intermediate users (ones that know enough to ask complex questions, but not so much that they can figure out the answer).
But in trying to solve that problem, they threw the baby out with the bathwater!
They were so fixated on solving that that they failed to realize: training all their power users to grief anyone who didn't behave like a power user off the site was detrimental (to having a site with non-power users). Everyone came for a question and answer site, but when it transformed it into a "question and get downvoted and modded into oblivion" site, everyone left.
AI put the final nail in the coffin, but SO was dead before AI arrived ... from this self-inflicted wound.
It doesn't matter because the duplicate is linked to the original, so most visitors coming from Google would still view the actual answer. It works like a soft HTTP 302 response.
Glad to hear about the book. I'll check it out. It would be interesting to read the author's opinions.
Otherwise I don't understand (yet) what point you're making. Who claimed that S.O. "merely got worse?" I see a discussion with many more specifics than that. One commenter in this thread mentioned griefing users. That's a familiar artifact of enshittification. (The white boxes covering up Google Maps, for example. Or the way Quora destroyed its own site in a quest to "improve questions".)
StackExchange is pretty friendly to beginners in my experience. I used to post straight-forward questions on math and stats on math SE and stats SE. I got answers within hours and sometimes minutes, and the answers were spot on.
Ime, math.SE had a much friendlier vibe than most other SE sites. Primarily because you could ask about a problem you were struggling with and get help. No moderator would instantly show up and close the question as a dupe of a ten-year-old question about double integration techniques or some such.
People asking questions mostly wanted help, but most moderators thought they were curating some kind of question-answer form encyclopaedia. Very different perspectives.
I think it probably depends on what communities you frequent. I am not familiar with the culture at stats.SE, but math.SE has a (semi-?) explicit mission of being more friendly to beginners than MO. I think that many communities aren't so friendly, and don't have beginner-friendly analogues.
Agreed for the math one. I went there when I was dealing with game engines and needed something geometry related or the like rather than to stackoverflow and they were far nicer.
Even inside SO each language and topic would have different standards. A C question would not be answered in the same way one about a JS framework would.
I'm curious about the other Stack Exchange sites. Have they seen the same decline as Stack Overflow?
Stack Overflow was the "flagship" product of the Stack Exchange company, and if the company pivots to AI, I wonder what the future holds for the other Q&A sites on the SE network.
All the sites are seeing huge drops in activity. Today only five or six sites get 10 questions per day or more, which was SO Inc's minimum activity level for a beta site before they would "graduate" it. Now most of the network fails that test. (You can see stats for all SE sites at https://stackexchange.com/sites#questionsperday.)
But I would argue that it usefulness only extends to its body of knowledge. As a service and/or community it has been pretty terrible for a long time:
If you were a new user trying to learn programming, it was maybe one of the most toxic resources available. I don't think I have posted a question since 2019. And even there, the only thing the average user could expect was a snippy response from someone who barely stopped to read your post. And/or a mod deletion because a similar-ish question already existed (regardless of whether it had a satisfying answer).
At a certain point, all the meaningful questions have already been asked. The site exists to collect novel new problems and not help people with iterations on existing problems.
(Also, underrated is the extent that the industry has homogenized around a couple of frameworks that are used for everything. I think it's telling that the peak of StackOverflow coincided with the era that React was taking off, to just name one).