They intentionally block casting from your Pixel phone to a TV, unless you use Chromecast. Google is terrible when it comes to casting.
I have a TV with Android TV and casting stopped working, and found out Google requires signing into the TV with an account now? I didn’t feel like doing that so started using airplay which TV supports too.
That would be pretty neat. But I think they should get connected calling and messaging between phone and tablet in there. Apple does it, Samsung does it, the web app doesn’t cut it.
Edit: and immediately after posting this, I found this
I would think this would be a huge boon for reverse engineers to potentially come up with a self hosted cast compatible interface. Much more opportunity for looking under the hood in this configuration.
This has already been done over wireless ADB and more if you just want mirroring. For content aware casting we essentially just have DLNA derivatives and nothing better.