Big one for me: cutting the Gordian knot of the philosophical antimonies, e.g., those philosophical dilemmas with no answers. Someone somewhere at Overcoming Bias commented that the "useful" parts of philosophy evolved into the natural sciences; the rest became the muted academic wordgames we see today (or something like that - the poster was much more incisive).

And just like that, my interest in those endless philosophical dilemmas dissolved. What a timesaver.

If anyone can locate that post / commenter, I'd be grateful.