I have to admit to not really understanding why someone would need the feature when OneDrive syncs videos and photos automatically and you can use your tablet or laptop to stream very easily... Then, I test drove the HTC One, which does this rather nicely and now I get it...
I would never stream a video from my phone to a TV, unless I was showing grandpa that great video of his grandkid playing at the park. I would never show my vacation photos on my TV, unless friends came over and were asking about them - at least the fun ones that couldn't go on Facebook...
I get it now, but for the most part, it's a small percentage of users that will share content to their TV's... And most of them have Android phones and TV's... lol