
Normally, you would expect updates to add features, and make apps better, but that has not been the trend recently for the Windows Phone YouTube app. The Windows Phone YouTube app has been hotly contested with Microsoft pushing to give its users a better native YouTube experience (although it has overstepped Google's rules), and Google shutting things down consistently...
Source: http://www.phonearena.com/news/YouTube-for-Windows-Phone-devolves-back-to-just-web-links-with-new-update_id48064