The funny part is that it’s actually not a pain in the ass to distribute. On iOS, saving the current link to the homescreeen installs the PWA (if available). You don’t have to do anything other than tap a button in the share menu. iOS treats it like an app, showing it in the app switcher and search, etc.

People just don’t know it’s an option. And as you say, there are fewer native APIs available to it.