I used plex for years and years with my lifetime license, but a few years ago I felt Plex was way too bloated and swapped to Jellyfin. I don't think about Plex now unless an article mentions it. There's no feature of functionality I notice that's missing, and I have a low tolerance for dealing with troubleshooting when I want to relax.
I haven't experienced this. I have the Chromecast with Google TV dongle and use a DST Nat to redirect all traffic from 8.8.8.8 and 8.8.4.4 to my own DNS server.
I also did this with my old Chromecast only from phone version