X11 is a pile of hacks. Have you ever tried to read the source code? When the X11 devs design a new system and stop maintaining X11, it's likely that X11 is not in a good shape.

>This isn't a good thing to me, especially considering NVIDIA hardware doesn't seem to be well supported. Someone come along and correct me, please.

It's the other way around: NVIDIA doesn't support GBM, the standard for buffer allocation.