At least since all wireless implementations I've tried have been very flaky and after the first the initial "this is pretty cool", immediately followed by "ouch, the input lag".
Which then is followed by flaky connections and if on a phone ridiculous battery drain. It is nothing but a source of frustration and waste of time so anytime I hear the word I just tune out.
Wow, that's an insane software design choice.
edit: looks like there's support for Miracast over Ethernet at least in Windows: https://learn.microsoft.com/en-us/surface-hub/miracast-over-...
It is important to note that Miracast over Infrastructure is not a replacement for standard Miracast. Instead, the functionality is complementary, and provides an advantage to users who are part of the enterprise network.
Discovery requests to identify Miracast receivers can only occur through the Wi-Fi adapter. Once the receivers have been identified, Windows 10 can then attempt the connection to the network.