> Though, I still don't understand what the comment I was replying to meant by, "Step 1: replace everything with something else."
If you have to replace things like the "start menu", the built in pdf reader, the built in settings app, etc. etc. all because of the same UI design flaw it starts to feel like you are fighting with the OS to get to the level of productivity with which you were previously accustomed. If you feel the need to have to do that, then something is wrong with the design of the OS. Obviously this is a subjective opinion that can differ for each individual, but considering the horrible adoption rate of Windows 8 it seems likely that this is an opinion shared by many.
Objectively, forcing apps to run in fullscreen mode can be a huge waste of real estate for large computer monitors. The gestures required to summon the "charms" bar and the app switcher are completely unintuitive and awkward for a desktop UI. Things like that make far more sense for mobile devices, but it appears like Windows 8 tried to combine mobile and desktop UIs in a confusing, frustrating, an inefficient way. It's quite telling that these were major design errors as Windows 10 backtracks from that philosophy almost completely.