2e is well made, and if you read tabletop systems for fun it’s worth knowing in passing, but it’s not going to inform how you play other systems the way Blades in the Dark or Call of Cthulhu might. Half the core book is conditions, traits, and spells.

I do encourage people interested in modern fantasy games to learn it to play it. For gamers who want crunch I much prefer it to 5e. Paizo’s #2 for a reason.