Initially, we all learn from our mistakes. The issue longer term is that we do not learn as much when becoming better players and 'winning' more. We settle into playing patterns with lesser mistakes.
I am currently doing a lot of experimenting, playing very loosely, even recklessly at times to not just broaden my range but to get a key understanding of a wide range of players. Its mixed results. I'll go to showdown against heavy bettors/raisers to see if they 'have it'. Overall, I lose more hands but it is interesting. Sometimes they are nutted, sometimes they aggro
bluff with nothing and sometimes they hit their high card on the river.
So I am slowly building some profiles on opponents and expecting future dividends. As for learning and the idea of studying, to be frank I am not convinced the majority of players do that much. Poker players like to give the impression they are always beavering away in the books but even Nick Schulman is fairly dismissive of the idea and believes even the top pros do not study half as much as they say.
I know that as long as I am working on 'something' I persuade myself it is enough when I could do more.