Currently I am using Sierra along with Windows. There are so many things I find lacking in Sierra that it is thoroughly mind boggling. I will list them No support for HDMI 2.0 No 4K @ 60Hz over HDMI No support for DTS-HDMA or Dolby-ATMOS lossless tracks playback. No support for DTS-HDMA or Dolby-ATMOS bitstreaming to home theater receiver like Denon No H265 support inbuilt. (You need to get a paid app) No support for any other open codecs like ogg, VP9 (Again paid app but those apps are limited) Basically, I find macOS Sierra to be very limited in multimedia/HTPC capabilities. Connecting their iMacs or even Hackintoshes to their new 4K HDMI TVs to get 4K @ 60 Hz is currently not possible. We may have to resort to some DP 1.2 to HDMI 2.0 active adapters to get things done and that too unreliably. Apple needs to get their act together and include all future technologies like HDMI 2.1, DP 1.3, DP 1.4, newer codecs. I can't believe no one is calling out Apple on this or are we all happy with the way things are? Releasing new iMacs to enable these features would be incredibly shading thing to do.