You are right, Apple also has some legit professional staff. And if the person using it gets paid a lot, then a one time hardware purchase becomes negligible.
Accurate fine motor control and even basic stuff like typing does seem not quite fleshed out, so that is indeed an issue. But I don’t think it’s a deal breaker that you can’t do long shifts with it, since you’d probably only use it for certain tasks.
Even more of a niche, but I could see it for something like architects. Both for work and to maybe even present to clients.