Why Flip for Frontbuffer()?

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In B+ you now require a flip command after drawing to the frontbuffer, any idea why?

Edit:
Ah, after reading more carefully in the docs it's only there for compatibility and returns the same reference as backbuffer(). Hm, Can't say I understand why you would remove frontbuffer? I use it to update a progress bar when loading to save myself from flipping and keeping track of two buffers. It also killed my pixel screenfades that were writing black pixels to the frontbuffer to blank out.
I'll rethink.