because optimal acceleration isn't generic, going forward maybe someone can use the gallium state tracker to make accel better but so far that hasn't happened.
Certainly, but we already have the situation where the DDX driver and the KMS driver are working in tandem. Naively I would imagine that acceleration in the DDX driver could go through the DRI driver where that makes sense and be pushed down to the KMS driver where it doesn't. Not as in tomorrow of course, but in the longer term.
On the other hand since I'm sure that other people must have thought of this too I assume that there are a couple of flies that I haven't spotted in that ointment.