Nonsens. The iPad is basically a 11 to 13 (Pro) monitor+computer with an amazing touch screen. Adding the official keyboard folio, or any bluetooth keyboard/mourse is trivial, and it makes for an excellent on-the-go machine. Not different to the 12-inch MacBook (circa 2015) and the older fan favorite 12-inch PowerBook G4 (circa 2003), and I know several devs who swore by them. Linus used and loved one of the latter (with PPC Linux on in his case).
The only issue is the lack of OS level support for some stuff, not the form factor.
Admins, devs working mostly on the Cloud, photographers, and writers already use it for "getting work done", I've seen execs too.
If I could plug my iPad into that cable to use it as a Mac I would do that all the time and buy a more powerful iPad. It would be an iPad for idle browsing and a Mac for the times I need a real computer.
https://www.sotsu.com/products/flipaction-elite-16?variant=4...
Just let me use my own keyboard/mouse when I want to use it like a computer. Better ergonomics too as the iPad would be at a good height.
At that point, an actual laptop is simpler.
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.