The Microsoft offering is inferior as a tablet and inferior as a desktop OS (again subjective opinion), but it lets you have both a tablet and a laptop form factor without needing to own two units of hardware.
In a lot of ways it feels kind of like when I first switched from Windows to Mac back in the early 2000s. I knew that for 98% of stuff I do with a computer, OS9 (and then OSX) was perfectly fine. But the hassle of doing any of the other 2% kept me locked in. Making the jump from OSX to iOS feels the same way. The apps all seem to be 90% of what I need without issue, another 8% okay enough for now, and then 2% just unworkable. (And then there is the nightmare of trying to use many regular old websites on mobile these days with all the unresponsive scripts and ad cruft they carry.)
I'd love it if Apple could figure out some kind of bridge for iOS workloads to meet this, similar to how Parallels or BootCamp can let you get by with those 1 or 2 Windows things you still needed to do after switching. Maybe just let the iPad remote into my Mac at home if it has internet or have it run some kind of stripped down, emulated version of OSX.
To me that sounds perfectly normal and reasonable. A tablet is not a desktop. A desktop is not a tablet.
People complain that they cannot use their tablets to do desktop work, but somehow never complain that their tower doesn't travel well to the coffee shop.
They do, but it's emulating a fingertip (for accessibility), not a proper mouse cursor. It was neat to play around with for a little while, but not something you'd want to do over a longer term.
iPads will also work with Apple's Magic Touchpads (the standalone units), but they must be connected via USB, and the same finger-emulating touchscreen caveat applies.
Slide a wireless keyboard and mouse next to a tablet and it should become my desktop computer.
That's very close to what the iPad is now. I often sit in a coffee shop and read magazines on my iPad. Then when I'm ready to do some work, I just prop the iPad up on a table with its cover and turn on an old Bluetooth keyboard I keep in my bag.
E-mail on the left side of the screen. ssh on the right side with the Prompt app. Bang, it's 90% of what I use my desktop computer for.
I've heard that iPads support a Bluetooth mouse now, but I don't have any personal experience with it. I haven't heard anything about trackpads.