3840x2160 resolution on a mobile screen seems just plain dumb and wasteful to me, and I have really exceptionally good vision. Even on a 27" monitor I can just barely see the pixels at that res.
Admittedly this is on a huge projector and not a phone. I don't watch enough Youtube videos on my phone to know if it would matter there.
> With the rise of 4K video, the AV1 codec is becoming popular for better quality on Android devices.
So I don't get why people are putting themselves in that situation in the first place. It's like choosing to use a fork to row a boat and then going waaaahhhh this isn't working very well... no shit, wrong tool for the job.
It likely vastly simplifies their backend to use one codec for everything.