If they start with iOS, there is no way they redo it with macOS in the next version. Also the UI is completely different and the input system is different. I am definitely not going to spend $3.5k and still buy a $1k MacBook to do my work.
I would happily spend $3.5k on an insanely portable, wraparound, multi-monitor setup for my $1k MacBook.
If this thing works anywhere close to as well as they say it does for that use case, I won’t be able to get my credit card out fast enough. The fact that it could be used independently is just a cherry on top.
Pretty sure one 4k window is more than enough to handle the things I can't do on the Vision natively.
Even if it's MacOS, what do you think the answer to that question will be?