Totally agree with you.. But i dont see it happen as they are not really keen on feature requests turning out into the products.
Also from a marketing standpoint they rather want you to buy hyperdecks then do this with CasparCG.
So yes build an emulator for Hyperdeck. ( Which is pretty standard plain telnet Text based )
Hell i should build a small ESP32 source for it. So people can trigger it themself
Which would also be able to do the same with Caspar.. Just a cheap $10 ESP32 in your network to link it.