TubeCast is not a full Chromecast implementation nor will it ever be. It only supports the first revision of the Cast protocol and will only keep working while Google keeps backwards compatibility with the Cast V1 protocol in their youtube mobile applications (at least for service discovery).
This disclaimer doesn't sound too confident, but if it works for op, then it should be good in the meantime.
miracast
I don't have an answer but I am piggybacking off your question:
Is it possible to flash another OS on the last gen Chromecast? Considering what's happening to the gen 2, I don't see a very bright future for my Chromecast.
De-Google (Coke)
Is Microsoft (Pepsi) ok?
I don't know if they still sell it but I have a Miracast hdmi dongle. (Wireless display adapter)
its so ridiculous though that miracast somehow cannot work with a wired network, but only directly through wireless
its so ridiculous though that miracast somehow cannot work with a wired network, but only directly through wireless
Yeah that hurts my brain too, but I have given up asking these questions?
https://fcast.org/