The YouTube app is great but when searching the web, it does not mean that I want to switch to another app just to read the comments on a video.
With iOS 10 public beta, this issue is no more. I quite happy!
There is a small issue now showing up: the top banner in the YouTube app is sometime not showing the icons. I've seen this behaviour in a few other apps so it's probably a glitch from iOS. The icons are still there as you can press on them, but you cannot see them.
The new iOS 10 is a great update. The new widget screen does look a lot better than iOS 9.
The first public beta of iOS 10 was slow on my iPad 4. Since the second public beta, its back to a more enjoyable experience.
The next update should iron out the last annoyances.