I joined Plex after I already needed to have a login to plex.tv to be able to stream. I understand that that already was problematic, but Plex was leagues ahead of its competition in terms of ease of adding users, as well as polish. You must be forgetting how awful Jellyfin was in comparison, even just 5 years ago. I've been keeping up on Jellyfin and it's amazing how far they've come. Now Jellyfin has great theme options, a simple-to-install skip intro/outro plugin, an app option with built-in jellyseerr integration, decent collections support (still needs some work here on feature parity with Plex, but it's on the way) and with Wizarr, onboarding new users is as easy as sending an invite link, just like Plex. All this came in the last 5 years, and were pretty much requirements for my use cases.
Sure you can say that I'm picky, but Plex really was the best option until like, this year. I started to accept the need to switch when they added the social media aspect to it. They completely ignored what their users actually wanted. Since then, they've been making worse and worse decisions, which is crazy because now more than ever their competition has reached their level. Hell, by pushing all their users away, Plex is only going to accelerate the development on Jellyfin.
Just know that if you are a manager, everyone is reacting out of obligation