The one time I had a Mac book some years ago external screens would only work if the laptop was on power, and after sleep I had to reattach the screen each time. This is issue was present the whole time (some months) I had this 2000$ beast (for the whole series, not just my Exemplar), afaik the 2015 macbook pro. Forums filled with the problem, no solutions in sight. Honestly a horrible experience that I could do nothing but wait with such crucial issues.
On Linux I could just edit my xconf and everything was fine.
I guess you never ran into https://spin.atomicobject.com/2018/08/24/macbook-pro-externa.... The chroma is broken on a large number of external displays when using OS X. Just search the apple forums for how common this problem is, and Apple hasn't fixed it in years now. It's one of the reasons I gave up on OS X because I need external monitors to just work without blurry fonts.
On Linux I could just edit my xconf and everything was fine.