[reisse]

It's all about hardware support really. AV1 is pretty new (2018), give it some time. E. g. Nvidia supports decoding since 3xxx generation, and encoding only since 4xxx generation.

I still vividly remember what a clusterfk was H264 support on mobile devices just ten years ago, circa 2010-2015. AVC spec was published in 2003, High Profiles standardised in 2005, universally supported only since ~2015. I personally had a 2011 Tegra 2 tablet which did support H264, but didn't support high profiles.

[jonny_eh]

Why does Adobe need HW support?

[bobdvb]

Rendering out at high quality takes quite a bit of processing, so it helps to have GPU / HW Enc support.