I wonder about that, too, honestly. Taking my comparison with vi again: I’m a vi true believer, having gone from a vi skeptic… but I don’t really have hard evidence that I’m truly, actually, indisputably more productive in vi than I would be with, say, notepad++ or sublime or atom or some other editor. I say the same things that other vi true believers do, and I’ve never seen or heard of anybody who was comfortable in vi who ever said that they regretted spending time learning it or that they didn’t think the time was worthwhile - but how do I (we) know that isn’t just confirmation bias? Or worse, how do we know we’re not just deluding ourselves to try to convince ourselves that we didn’t waste time learning - or justify time spent doing something we enjoy(ed)? I’ve been learning Scala on and off for a while and it _feels_ better and more correct than Java, but maybe I just want it to be better and more correct than Java.