Facebook beta validation of Metro UI limitations?

Having played with the Microsoft release of Facebook Beta for WP8, 2 things are very apparent:

  • The UI is almost identical to, and certainly uses many of the interface metaphors of the Android app
  • It is clearly a massive improvement on the current WP8 Facebook app
Similarly Twitter vastly improved their own WP8 app by doing away with most of the metro stuff and just keeping the design consistent with other platforms.
So the question is, isn't it time Microsoft updated its metro design language, making it more flexible and logical?
(Personally I'd like to see the endless side scrolling put to bed. Having to scroll through 3 or 4 pages just to see the top hierarchy of menus is a terrible design trope)