I feel like this is exactly what they want. My only question is how much i'll be able to modify my laptop long term. Ie i run Nixpkgs (ie the package system from NixOS) on my laptop. The day i can't modify my Mac OS to my liking is the day i stop buying their laptops.
I do think there's a market for people who want laptops that have the lockdown of phones. Where less things can go wrong because you can't change a lot.
My M2 air is as thick as my iPad ...
Having said that it is also MUCH heavier (relative to what I'd like an iPad to be) and has a noticeably bigger screen.
Not sure how fast those gaps get closed.
If MacBook Air is a browser machine, then it's already happened. If it's a creative work machine, then well, it's close, but you still probably have a some kind of PC nearby.
If it's a developer machine, then the best iPad can do is being a ssh terminal or VSCode browser. A superb terminal, I use it every day to work because I don't have personal laptop.