Push notifications are impossible on iOS PWAs. Basically takes out a big chunk of possible apps you could build on this, no one wants e.g. a messenger that can't notify you when you get a message.
I deliberately disable push notifications in all messengers to avoids distractions, even though I'm actively using the messengers _when_ I want to sync with people.
Other users have other priorities.
"Nobody wants...." is probably best interpreted as "No developers want to build..."