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YouTube moves to AV1 by default to the dismay of some Android users
(www.androidpolice.com)
This is a most excellent place for technology news and articles.
I think only the last generation or two of iPhones even supported h265. That said there's a lot less reason for them to take as long supporting av1 if my understanding is correct about the patents Etc. And yes av1 is a massive step up. I've been redoing much of my jellyfin library with it and it's fantastic. But they should still at least offer a fallback of 264 or 265.
The Apple A9 (iPhone 6S) added hardware decoding support for HEVC/H.265, the A10 (iPhone 7) added hardware encoding as well. If I recall correctly Apple was pretty much first in supporting saving video recordings in HEVC.
You might be confusing this for AV1 support, which Apple added with the A17 Pro and the M3 (both decode only though).
No I'm not confusing it. But I'm definitely no expert. All I know is that especially over the pandemic years probably because of lots of family without newer phones at the time though I could have sworn several were. I kept getting lots of complaints about files not playing it all ended up being about h265. So you are probably right.
I am very much not a Microsoft or apple person.