Yeah, from what I've seen some weird edge cases often are fixed after bug reports, not becasue there is some sweeping benchmark that catches them. I suppose GPU

Yeah, from what I've seen some weird edge cases often are fixed after bug reports, not becasue there is some sweeping benchmark that catches them. I suppose GPUs are in general more complicated to address than CPUs in this sense. And it's not always even some intentional secrecy, possibly GPU makers themselves don't anticipate every problem in advance. Driver developers just find some of these issues after some known case exposes them and try to work around that.