I work in software engineering, where we often take screen recordings. The macOS screen recording software by default records to HEVC, so it would be much appreciated to have HEVC support since many of our developers use Mac, as the alternative is Windows.
For me HEVC support is important for Immich, where I transcode all my videos to save on bandwith.
All my extended family uses firefox so I currently use AV1, but HEVC would leverage hardware acceleration as well as work on more devices (looking at you iPhone users).
HEVC is working on Linux for MSE (codec string passed to addSourceBuffer) based video for Firefox 137, 138 beta and Nightly. The problem is that I'm developing an application which is directly using the VideoEncoder and AudioEncoder. Only Firefox Nightly supports HEVC on the VideoEncoder (the codec string used is hvc1.1.4.L153.B0). Hopefully there are plans to implement this functionality on upcoming releases?