I remember when Vista came out and my customers that “upgraded” without asking hated the $#!+ out of the new vista. I had two choices - upgrade them to XP which made them angry because they paid for something they hated and then didn’t use or put ClassicShell on - it made Vista, Windows 7, Windows 8, Windows 10 start menu and many other things just like Windows XP. So for about a decade most of my customers preferred the old interface over the new one- with win 11 most of my customers were happy with the new menu as Microsoft finally got it right after a decade of forcing a bad menu on people.
Why not offer people a choice? I’d be fine if Plex said - well we aren’t going to do any more work on the old Plex interface - hey at least I get something usable. The new one is about as useful as using a stick of butter as a catcher’s mitt. I’m sure butter has uses but it isn’t a good choice for catching baseballs.