H.265 is viewable on almost every computer made in the last few years, Mac and PC. Windows 10 has native support. VLC supports h.265 cross-platform. Plex Media Server supports h.265 cross-platform. Handbrake supports encoding h.265 video cross-platform.
I encode and watch h.265 video on my Macs and PCs on a regular basis.
I said MOST computers. What part did you not understand, dear? AND NO, IT IS NOT H.265. You should take your complaints to Apple, not me. Get a life.