I don't have a particularly high end media player (Realme 4K stick) but the only playback I have the occasional issue with is Twitch.tv. I get warnings of high cpu temperature and sometimes it crashes. This is at 1080p 60fps. I don't have any problems playing 4K content on different streaming services and I thought they had to be higher bitrate.
It could have something to do with the fact that many broadcasters erroneously believe that they're doing their viewers a favor by transmitting at excessive quality, not realizing that it causes high load for the viewers because twitch doesn't transcode most streams.