This may be in part because people that automatized their media servers are using hardware acceleration for transcoding (from 4k for example), and hardware has

This may be in part because people that automatized their media servers are using hardware acceleration for transcoding (from 4k for example), and hardware has only recently added decoding for AV1. In my case, I get both 4k (h265) and 1080p (h264) blurays and let the client select.