Lots of people missing the point here.
What if you had a tablet device that could go weeks without charging? It could handle basic tasks on its own, or more intensive tasks when connected to the internet?
Office 365 is a good example. Basic tasks of word can be handled by a cached web client, but if you need to do something more advanced and need the full version of word to run, the ARM architecture can’t run it so spin up a virtual instance and stream it to your arm device.
Windows 11 will have this baked in. It’s not a forced replacement of a local OS.