If devs would only look to the symptoms and not the specific disease, I am quite sure a decent solution to the whole 3D acceleration issue could be found. But it requires thinking "outside the box of conventional wisdom". Something that would seem utterly ridiculous on its face, but I believe it would work. But until it's tried, we'll never know.
Simple description: make your own video card.
But the "how" is part of my "Crazy Concept Ventures". Something that, in order to implement, requires closed-source forking, development of a hardware platform (accomplished by building said bits of actual unique hardware), people assigned/devoted to individual code/driver development (and paid to do so), etc.
I have $22K at my disposal to see this project started. And more coming in from the rise of Bitcoin ($5K profit from my investment, at the moment). What can I get going for that amount of money?
Sometimes realizing a vision is worth more than the risk of needing that money sometime. I'm willing to take that risk, if my vision is feasible. Don't even know if it is. But I'm willing to give it a shot, if anyone "crazy enough" is willing to follow. If Haiku, as an actual platform, could become something people look at and say, "Whoa... how'd they do that?!?", it will have been worth it... and then they buy! Because what Haiku will do, on that platform, has NEVER been done before, because it CAN'T be done on an existing OS (Windows, MacOS, Linux, etc.) without breaking everything. It must be built-in, as the very foundation of the OS. Not a patch-over.
Time to get "crazy"? Or you can continue to complain about non-existent 3D hardware acceleration... amongst other issues on Haiku.