Performance. For example: hardware acceleration of movie decoding is (was?) a bit of hit or miss with Linux, while it usually "just works" on Windows. Win is also faster that Mac OS in this regard: mainly due to certain APIs being not available for 3rd party software. The movie might be smooth in QuickTime, but VLC or Kodi will stutter.

At least that was a case few years ago, when I was checking how to play a full HD mkv file on my Mac Mini.