I think they consider that a feature. For the record, I absolutely agree as a consumer that TVs just need to be awesome display panels with a recent remote and sufficient inputs. But I understand why the manufacturers may not want to buy into that.
I grew up with a TV that would immediately turn-on when you pressed the button (you could even hear an audible sound from the TV set), and the cable TV remote (it was separate in the 80s too) could change channels at 4-5 per second (this is when channels surfing was born because they would render so fast).
Vizio has a line of OTA-free displays, but they still have a Linux kernel. This is a good start, but going back to whatever RTOS they use to have would be better.
[0]http://www.lg.com/us/business/commercial-display/displays-tv...