The one I mentioned about certain USB mice dying has never been fixed. Another thing that will never ever be fixed is the lack of choice video cards that I can put into the PCIe slot on my Mac Pro. Other problems with PRAM or SMC/sleep have a "fix" but somehow they keep popping up and you have to keep applying the fix. I can tell you honestly that I never have recurring problems on the Windows because things get fixed quite rapidly since Microsoft obviously still cares about Windows.
Anyway, I don't care about Chromebooks or other walled garden devices really. Even if I just wanted something to browse with I would prefer a Windows tablet so I could have some freedom ;)