Sure, if by "people concerned about security", you mean, "people who have kneejerk reactions with no analysis whatsoever".
Compare/contrast with a theoretical Microsoft action is neither analysis or valid argument. Reading this thread, I'm surprised at the amount of misinformation floating around from *lwn readers*, of all people.
People who have untrusted users can use the locked-down guest account for those users. People who fall outside of normal use case scenarios can easily just change the default to disallow this. Generally anybody who is locking their system down anyways can just add this to the list (or have this as a standard switch that gets de-activated in kiosk mode.)
Personally, after setting up several machines for people who fall under the more general fedora-targeted use-cases, this provides a much better user experience. I'd rather let my wife and mother-in-law install their own software without having to give them complete sudo/root access.