D&D gave a decent gaming context for the fantasy world, and it is actually quite flexible because once you know the rules, then you start breaking them. The mechanics are just probability dice rolls, which all these games have in common. I like how the old AD&D books got my imagination going, and that was enough for me, so I never bought into the newer editions.
I checked out Cypher Rulebook today ... quite remarkable. I can actually create a character with a skill focus on "Doesn't Do Much"? Ha ha ha ha!
Yeah, I'm gonna take 2 pts of "totally chill" on my next turn, ha ha ha.