That form factor exists on the windows side for about a decade now, so yes people do actually use it day to day for their work.

It's easy to forget that many laptops are used 99% plugged to a hub and an external monitor. I have a keyboard and mouse I like a lot, and having a tablet floating on an arm next to my other screen instead of half open clam with a useless keyboard pointing at me is incredibly freeing.

Even on the go, bringing a bluetooth (trackpoint II）keyboard is just better overall IMHO. It's up to people's taste, but tablet form factors are not some unsolved mistery. Commercial success would of course be another discussion.

I have a kickstand case with a magnetic Bluetooth keyboard and integrated 3rd party pen holder and it works just like a laptop but supports the pen, plus I can leave the keyboard behind and prop it on my treadmill to watch movies, etc. It's actually a lot more convenient than a laptop in a lot of circumstances.

I've seen people use their (non-Apple) tablet in the kitchen for recipes. Can't imagine taking my laptop to the kitchen.