Yes. I actually haven't really used it in the past month or so because I've been using Kodi locally, but I put up with bugs for 3 years, at least. For example, subtitles just dying, and files refusing to play. It got so bad, I setup a home assistant script that used adb_command to force kill and restart the Plex app. I could say "hey Google, piece of trash" whenever subtitles fully just stopped working, or it hung randomly, or whatever. My blood pressure has gone down significantly since switching to Kodi, but I keep pms running for mobile and web.
No it's not at all. I'm not sure what part of their config is causing this, but I specifically have people use either a CCwGTV, Fire Stick, or Apple TV for HEVC and none of the Chromecast users have had any complaints. I have subtitles turned on across the entire server too.