Gist of it is
it affects intel graphics on all 10.13-10.15, unsure of 11.x
it affects nvidia graphics on 10.13 using web driver, unknown about 10.14-11.x with nvidia graphics, considering so few of them left, not that they’d run wow with any sort of decent performance anyways
it affects AMD if < 10.15.x but seems to be massively reduced on amd 10.15-12.x . Although I have still seen glitch in tiny amounts as late as 12.0.1 on AMD recently so the underlying cause may still exist even if it’s greatly reduced.
My prediction. considering apple abandoned nvidia long ago and just abandoned intel, it’s likely the bug was on their end but they only bothered to fix it on AMD because that’s generally how they do their software support. deprecate older hardware fixes VERY quickly.
In other words, because it’s an issue not affecting M1 video drivers or current AMD mac drivers, i wouldn’t expect much effort on apples endn to fix. Blizzards end, that remains to be seen but their mac resource allocation is pretty lackluster these days.