Miracast is heavily broken on many devices and rarely works at a reasonable level. Netflix and Google worked to create a good streaming standard names DIAL. Google took the idea and ran with it to create the Cast system which ended up working really well.
But the Cast system doesn't send arbitrary bits to the TV. It's a protocol for handing off authorized streams which are then processed by the TV (or in most cases the device connected to the TV by, ironically, HDMI).
So it's not really a method to stream arbitrary visual and audio data to a TV.
Well, you _can_ do screen mirroring with Cast, at least on Android. In my experience though it has fairly high latency and will occasionally freeze for a few seconds at a time.
