This is fair but is your average person setting up plex servers? My guess is no.
The whole "are the normies capable of this" argument has turned into an arms-race against Youtube/FB for easy setup guides.
That said, yes, the number of people they'd loose over shitty interfaces is probably kinda small, but I'd argue that as guides, youtube vids, and even all-in-one seedboxes become more available, that population is gonna grow. All it takes is some streamer to lay out the current process.