The claim was "no one wants x", the reply "I want x", your counter "others don't want x" as an attempt to dismiss the reply. That is unfair, the original claim that no one wants it was wrong and it was correct to point out that it was wrong.

The fundamental question is: would anyone choose to implement a messenger app as a PWA on a platform that doesn't support reliable notifications.

"Nobody wants...." is probably best interpreted as "No developers want to build..."

The idea of PWAs is that you make them once and they'll work on all platforms. The reality doesn't quite live up to that idea as this thread shows, but to me the idea to have single-platform PWAs still seems so odd that I would not interpret it that way. Still, if that was what was meant, then sure, I think I agree.