I'll explain, without doing any research of why he was talking out of his ass:
For a software developer, or hardware developer to limit themselves by a single source display, is cutting out millions of dollars in profit by reducing the options of choice. As reference not everyone uses a TV, I use a projector. Another reason is that would be corporate suicide, not all companies would conform, thus the hardware developer that left it open ended- able to use multiple outlet sources- would win millions of gamers and profits, regardless of quality of the system. In short that would be dumb. So tell that dude to go play with C++ in his grandmas basement and shut it smile emoticon