Well yes you do sit and wait for Plex to log you in and for their logo. Jellyfin is up and ready to go nearly instantly.

I think jellyfin does have the information I want, but gets out of the way and lets me get on with it. All the extra crap Plex ads like their own channels, searching outside my libraries is all just more stuff I have to turn off.

However, I think it's ok to say it works for you and jellyfin works for me.

Which is about different than jellyfin needs to catch up. It's already surpassed Plex for some.