Indeed, and MorphOS does not use Warp3D as we know 
Of course not, but it doesn't change the fact that if you *were* lumbered with having to support that particular 3D rasterizer (notice I don't use the word accelerator here

), you'd also be doing all the work in software too.
In case it was missed, my point is that despite all the handicaps the system featured in the video has, it is still churning out a half-playable framerate, which I'd say demonstrates there is some life in the old dog and claims that the old boards are entirely useless is not really founded.
In my personal experience is any measure, for OS/RTG friendly classic software on such a machine, unless you have a 100MHz 060, you probably aren't going to get a faster 68K experience out of your existing classic hardware. And as I said, the real irony is that it's more recent PPC software for 4.x that struggles, simply because it's generally written on and for faster machines.
The real issue is that such hardware is just too stupidly expensive to be viable compared to the alternatives, whether real 060+3.x, OS4, MOS, AROS or UAE.