Sigh. Whatever your reasons were for including the Facebook and Flickr functionality in the first iteration of the Photos app, why take it out? The code is written, the work is done, and people clearly LIKE it. Why not just let people have stuff they like?
One of the things I like about Windows 8 is what seems like a shared design ethos with Windows Phone -- my life and my content take front and center, without being siloed into a bunch of different apps. If you're going to remove the "hub" aspect of the Photos application, why not do the same to the People app? After all, "soon there will even be a Facebook app from Facebook"! I'm sure that will let us "socially engage with our friends" as well as our photos (however one "socially engages" with a photography).
This strikes me as a simple and intentional regression, stepping away from something that represented a real innovation in UX.

