What you say is correct, but that reddit thread concerns (I think) a narrow class of devs of which there are many here: US CS majors who graduate with only a few semesters of calc and discrete and are underequipped to bootstrap themselves if they need to understand, say, topology. But they have to gain some understanding, so i put a few book lists in that reddit thread, took about ... 5 minutes.

BTW I really like what i've seen of your guidebooks, or whatever you call them (neo-textbooks?).