I found How can I mirror something on a PC's display to my Android's display?, but that's from nearly 7 years ago, and no-one's even commented on it, let alone given a useful answer.
Maybe I'm missing something, but it seems to me it shouldn't be a major technical problems to implement a cut-down version of remote control software like LogMeIn / Chrome Remote Desktop / TeamViewer / etc. I'm not exactly trying to control the TV remotely - I just want to replace the HDMI cable between my PC and TV with a trivial app on each end that will send the required video information wirelessly through my home WiFi.
I understand there are certain video players that can do something like this (using protocols such as ChromeCast, MiraCast), but what I want to send is just the entire PC display (whether it's currently running the VLC player in full-screen mode, showing the computer desktop, or whatever).
I don't even care about sending the associated audio information to the TV - that's always gone straight from the PC to my hifi ('cos imho TV speakers are never much good).
Is there anything out there that can do this? Or some clear-cut reason why it's simply not practical?
Note the capitalised OR in my title. If it saves me needing to run a video signal cable across my living room, I'd happily bring forward my planned migration from a Win10-based PC to one running Ubuntu.