[sofixa]

The thing is though, when there is an issue on macOS (like it complaining a USB peripheral is using too much power and it has been suspended, of course without saying which USB peripheral, or the iPad you want to extend your screen to not showing), there's usually not much you can do. The OS is pretty closed down, very specific and the majority of materials online are on the "try turning it off and on again" level. With Linux distros there might be more to debug, but at least you can debug.

PS: If anyone has any ideas about my USB device, I'm all ears. A colleague advised the system report from the Apple menu, but it's a snapshot in time, so useless for my problem.