I like OAuth for simplifying my login process mainly. I use Authentik for a lot of my home services (calibre, nextcloud, freshrss, etc), and not having to deal with Plex’s authentication service would be awesome. In fact a few months ago my work started blocking Plex, not my home domain though so I can access the webplayer but not login now (so no more morning local news in the background now that I’m back in the office).