Re: If all they do is improve Smart TV UI's...
The UI isn't just about what input device you use.
If you are looking in the Live TV section, you have a particular screen layout and buttons to press if you want to do something.
Go to the iPlayer app, and you will find that the screen layout, and the buttons to press to perform similar tasks is completely different.
Go to the place where you find live TV shows that you recorded earlier, and everything is different again.
If your TV has ITV Player that is probably a completely different interface again.
Youview integrates the Live and On-Demand TV services. Maybe that is an improvement. I haven't seen one in action yet, so I can't pass judgement.