I was thinking the same with my 7840u. Could try something a bit more cutting edge than Mint, though I will admit I have no idea how up to date they keep the kernel these days. Though if they live boot, they’re removing the SSD and likely qtile from the equation, so it’s a bit tricky to isolate.

Yes, but CachyOS might not be, and while it does a bit to make things substantially easier for your friend, you’ll have a lot of familiarity with it as an Arch user.

Source: An Arch user for 15 years who just installed CachyOS when I wanted to switch from Cosmic to KDE.