chautemoc: It's proven in countless benchmarks you get significantly better performance with newer drivers. I recommend you install the newest and compare before and after. You will surely be pleased.
Knowing how many times I had to rollback drivers to a previous version because the latest one caused crash with game X or Y, always installing the latest drivers without checking first for known issue could be a double edged sword... especially for GoG users playing older games.
About Steam auto-updating... honestly I don't care at all, even if I was letting Steam auto-start at windows start-up it would probably be something I would deactivate anyway.
I would rather have hardware manufacturer enable their drivers to interact with windows updater instead than using yet another third party program for that.