You can still have that. Make unbreakable the default, and add an "admin mode" toggle.
The last 25 years of Apple has made it pretty clear that’s not “the Apple way”.
Yeah they could. They could do a lot of things people constantly ask about, like upgradable RAM. But there is no reason to think they will.
As I noted here https://news.ycombinator.com/item?id=47369155 that wouldn't stop the people that need the protection.