What specifically do you mean when you say “Open MacOS”? Open to what? You can already install anything you want on it. It’s unix based, so your terminal works mostly the same as in Linux. You’ve even got a package manager (homebrew), so you won’t miss apt or whatever else you use. iOS is another discussion, but imho, OSX is “open” enough.

Superb write-up, well done! Echoes my experience completely.

Well well well…… Looks like someone found out. Lol