Looking at the AMD and nVidia software, I see it surfacing a lot of hardware-/vendor-specific options and I don't see how it could be done any differently. Then there's Realtek, where I've never seen their software add anything useful that doesn't already exist in system settings. But then again, there are drivers like those for the Xonar DX or other soundcards where a bunch of useful features and configuration options are surfaced.

I think there are pros and cons. PulseAudio could possibly be half the incomprehensible monstrosity that it is if it didn't have to take over the responsibilities of every audio driver out there. On the other hand, Realtek will arbitrarily disable/hide features with no way (that I've found) to do anything about as a user.