Hardware support for decoding should be pretty good these days. Any TV or streaming box that supports 4k streaming should support HEVC, since AFAIK all the streaming sources use it (except for YouTube, last I checked). I suppose if you’re streaming on a laptop you might be stuck with software decoding.

I’m also very impressed with HEVC, but mostly from the angle of UHD Blu-rays. The quality is remarkable. For the same size or slightly larger than 1080p Blu-rays (around 50GB, sometimes up to 70), you get 4k resolution (4 times the pixels as 1080p) and HDR.