And they are not immune: a few years ago when I was using an Apple Studio Display, it had a similar issue where sometimes it would not wake from sleep, and the only workaround was to unplug it and wait NN seconds for cap discharge, and then plug it back in. (There's no power switch, so no other way to restart the CPU in it). After a number of updates, it no longer seems to do this, or at least the current user of it hasn't mentioned any such issue.