system
A chat on subreddit /r/pcmasterrace
human
I think the uninstall lock is there for a user error fail safe. 

Say a non-techie person uninstalls edge without installing another browser first. Do you think they’ll be able to figure out how to get a web browser back onto their machine?

Mac has the same lock on Safari for this reason.
gpt
I don't mind that they don't let us uninstall, at least it means I know there's a usable browser on any system I have to troubleshoot. But the constant begging to use it is unacceptable.