H264 was the same way early on, with several chips doing baseline or main profile, but not high. It's why I said (at the time) that H264 HW support wasn't impor

H264 was the same way early on, with several chips doing baseline or main profile, but not high. It's why I said (at the time) that H264 HW support wasn't important... being able to do Bluray profile (a specific variant of high profile) was what was actually important. Now with H265, Bluray 4k profile is important, ergo 10 bit support is mandatory, as well as display output itself being able to handle signalling for Rec2020 HDR10 over HDMI 2.x (or equivalent DP).