He is using the top of the line hardware because of the nature of his work. And I'm presuming you can't disable the iGPU. You are really boxing him into a terrible situation and just because you can tolerate Linux nonsense does not automatically make it an ideal solution for others.
>What nonsense? I see lots of Stockholm syndrome from Windows users who like to invent issues with other OS'.
Agreed, I always push back on nonsense from Windows users as well as Linux users. Like I mentioned in my original comment, his main complaints could be solved by Apple but he is stuck with a poorly designed OS given the nature of his work. Linux would not be an improvement as it would still present him with a litany of problems for him to complain about. His main concern would be addressed with the top of the line M series GPU.