- They would suffer from the same adoption difficulty hardware video encoding suffers from.
- They would suffer from the same quality issues and format limitations compared to software encoders (where intel/nvidia dGPU hardware AV1 maxes out at ~x265 medium last I checked)
Still it would be interesting to see it implemented. Sure it might be more limited in features compared to software encoders, but at least it could be an option when it's acceptable with software encoders being another one when more features are needed.
Adoption time is applicable to anything new(ish), so AV1 isn't really special in that sense. It's already close to reaching wide adoption in hardware, so it's progressing well.
HEVC wasn't ubiquitous right away either. But it's DOA because of patent trolls like MPEG-LA. AV1 came later, so it will take its time to become ubiquitous while avoiding issues of HEVC.
Apple is a brake on the progress, as always. They'll arrive last.
Comes with substantial compute costs at scale… know of companies where the cost of supporting AVIF is many millions more than the cost of supporting JXL
And software encoders are improving as well.