I'm confused. How is Stage Manager a "developer-hostile move"?
I haven't upgraded and used Stage Manager yet so I don't have any opinion on it.
This seems fine to me. The problem is regular users follow some instructions that say paste in to the terminal and then the OS asks for a password like it always does, and now you have malware embedded in your OS.
With the new model, you’d have to guide the user through getting in to recovery mode which is either too confusing or sets off alarm bells for the user.
As a developer I can’t really see why you’d want to touch these OS files unless you are hacking on the OS itself and at that point you should be smart enough to know how to turn it off