Learning a new game is much easier when the mechanics are intuitive. Running the game as a GM, and creating characters and making decisions during play, is equally easier, and often a lot more fun, when the mechanics are intuitive.
Intuitive Does Not Mean Simple
The trend for newer games is for simplicity. There’s certainly nothing wrong with this, especially for pickup games, but a lack of complexity also means a lack of long-term viability for most groups.