I have an Intel arc A750 and so far it's been great. There are still some bugs with direct x12 games because the driver isn't complete. Specifically unreal engines nanite system games will just not launch. But there a already a fix for it so I'm just waiting for it to get merged
I think most of the issues with games not working should be the same between windows and Linux driver versions, and HardwareUnboxed has done some pretty exhaustive testing recently on the "maturity" of the drivers by testing a couple hundred games for obvious driver problems.
I have had the A750 for a year+ now and play most games on Linux. mainly indy games and path of exile. PoE plays better under Linux than Windows, by far. I have not had driver issues at all (or that were noticeable to me) but it isn't like I have tested it extensively.
If you are into PoE then you may know about how unplayable blight, esp blight ravaged maps can be. Slide show or worse for me on Windows with both the A750 and with the older NVIDIA card I had before. Under Linux it plays quite well except with things hit hyper density of mobs situations and even then its still playable.
Probably because they want to use this card with an old board, which means an older CPU, which makes no sense with a card this powerful, since it'll drastically bottleneck GPU performance. It's a common mistake people are making though.