you don't say...
BUT here's the catch: no open and no closed source driver developers give a flipping fuck about them. i wonder why...
in contradiction to proprietary developers, opensource ones have almost full control over entire system they developing for and not just their part. with good reasoning _anyone_ can compel major changes in API, ABI of big project or even some changes in its workflow if resulting benefits outweigh the costs for most parties involved. and you don't have to posses billions of cash and an office in every part of the world for that.
they maybe lack 1/2 or 1/4 of functionality _yet_ but they crap as much as 10 or 100 times less in your system.
current record of uptime in my system for fglrx is 2 days, for xf86*/mesa about a month and this because i decided to update kernel and reboot. Nvidia blob could achieve same but it's still bugfixed by "if not 'too many' people are affected - fuck it" attitude. intel... they is just not too much to open, really. all their sweet stuff is in Linux world.
when mesa was lacking OpenGL 2.1 support most trolls were sprinkling theirs spit all over the place because "this is what most application and specially games using". now it has but "THERE IS NO OGL3!!!!!". it's nice how they omit "which nobody, other than big-money animation studios, using" part.
yes, those features important and must-have in overall but now we have
1) very few highly qualified digital graphic professionals.
2) those what we have prioritize quality of code and stability of work over speed of development (and speed in performance too - it's done properly, then it optimized).
3) fucking gazillion of drivers and almost everything working right out the box, beside some heavily modified OEM bullshit with zero support from vendor (who, most likely, is not manufacturer) even on "target platform" (say: Windows(tm)).
people who do that are fucking awesome, their work is fucking awesome and entire community relies on it. and they shown to be reliable so community can rest easily. but you, get sicker and die, please.