What is the difference between an iPadOS laptop and an iPad with a keyboard-case?
It has the same specs of a good laptop, the type cover is sturdy (but easily replaceable in the worst case), removable for tablet use and the screen doesn't wobble a bit.
I consider it a lot more flexible (and studry, since there is no hinge to break) than a traditional laptop.
Yes, the screen could be larger.
The type cover is not only "good enough" for all but full-time use, it's also upgradeable — which I've taken advantage of — and easily replaceable in the case of damage.
As for the screen size, I agree in part…but if it were any bigger, it wouldn't fit perfectly in the back of my camera bag, which, for my purposes, is a significant benefit.
This coming from someone with a mechanical keyboard, two pointing devices (Magic Trackpad and wired, many-buttoned mouse), and a 55" 4K display on his desk.
[1] And using the Microsoft Bluetooth folder…also a surprisingly usable device given the limitations inherent in its design…as a temporary alternative.
A clamshell has better balance because of the battery and internals in the keyboard half instead of in the screen. It has better screen angles and is usually smaller and lighter than both parts of a detachable.
It doesn't work at all as a tablet though, and a touchscreen is an afterthought.
I paired a bluetooth mouse to mine on the iPadOS beta and have been using it for work for a couple of weeks. Much nicer to use than my work-supplied Surface Pro which isn't saying much, since they are awful at using on your lap).