Just getting around to ACTUALLY READING YOUR WORKAROUNDS 
So, after all these months, that was the simple fix, sure itâs annoying to have to turn off subtitles on everything on the live tv
All client side settings on the android versions of Plex, seem to do basically nothing, including forcing subtitles in the Chromecast/android Plex settings. Only this on the servers language settings.
Unfortunately thereâs not enough parity of client side settings. The Chromecast/android version of Plex doesnât allow you to âneverâ burn subtitles like the Samsung version of Plex. If there was a difference between live tv subtitles, vs local media or Plex free Media, then youâd be able to even just set the forced subtitle burn in for the live tv alone. Currently, forcing âalways enabledâ subtitles under language settings, affects all users and media globally within your âPlex homeâ but their clients canât properly disable subtitle burn in client side, since different apps have different options.
Plex on Chromecast/android has âAutomatically, Only Advanced Formats, and Alwaysâ where as Samsung, you get âalways, automatic, neverâ.
So I can override it on my PC for web and windows, and Samsung, but not Chromecast/android. So you have to manually turn off subtitles on everything else you watch because thereâs no âneverâ burn subs option.
Also interesting to note, before using the server side settings for sub burning, I could get the streams to play on the Chromecast/android by changing the quality from convert automatically to another transcoded bitrate, but the subs would be enabled even tho the sub menu was selected as ânoneâ and you would have to then change the subs to the âunknownâ and back to none to remove them, but stability suffered from that even after the server side subtitles settings was forced
