Maybe it's because I have a very old Chromecast. But my Jeffyfin+Chromecast experience is far from flawless. It has quite a few random stutter problems. Disconnects between JF on phone and Chromecast.. Subtitles not rendered properly or double rendered on top of each other (and too few customization options).. Poor support for codecs so a lot of transcoding needed (which I think is the cause of the aforementioned stuttering, but I'm not sure). Compared to the android TV or web app it's really not that good imho.