Okay, but I want my characters to evolve (this doesn’t mean level up) no matter what I do (isn’t that what real life is about ?). So if I spend my time reading about architecture or archaeology or whatever in the game, I expect my character to learn about these topics. If he doesn’t, something feels wrong to me.

That’s why I don’t like Class/Level based systems, and I prefer flesh & blood GMs. They can adapt their responses to what I’m doing or to what’s actually happening. 🙂