Youtube app would be nice to have on the Youview box. I the now at times use the Youtube app via my Samsung smart TV.
My experience with smart TVs has not been great, I have a 4 year old Panasonic, it updated for the first year, but after that nothing.
The Youtube on my TV is not very good, after watching HD for a short time the picture becomes fuzzy. ( I have tried cat 5 & wifi both give the same result)
Not prepared to buy a TV every couple of years, so I bought a Amazon Firestick(I have the old one which cost £25 but the latest is nearly £40), which plugs into a spare HDMI socket and it connects wirelessly to my hub.
The only downside the app choice is limited, eg I cannot get the Tripadvisor app.