Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
I don't care about iOS. Why would I do any heavy browsing on it ?

BTW, iOS Safari already plays YouTube videos in the native player. IDK why people download the YouTube app. It just means you get ads and can't play music in the background.

If you don't care about iOS, why are you in a thread about Safari for iOS?
 
Well, it's up to apps to support browsing inside of them. But what you are describing is sort of the other way around where apps register to take care of different content that can come up and be selected from Safari--basically YouTube will want to play back a video within its own app rather than have you watch it in Safari.

Apple can force to play video, audio, and display websites within an app as part of their developer guidelines. They should give an OPT IN option to launch specific files in a different program (like links in Safari and word documents in Microsoft word)
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.