Plenty of players still don’t support AV1, though with a modern gpu you can brute force transcoding it on the fly.
I have a jellyfin test server running an an intel n95 and it can easily handle a couple of 4k AV1 to H265 transcoded streams on it’s own with decent image quality, but it struggles with 3 if the bitrates are too high. still, it’s more complexity than is needed considering AV1 only saves a small amount of space over a good H265 encode which are ubiquitous on the net.