I disagree.  It's not a new feature.  We're merely completing an old feature (adding new-style buffers from 3.x to 2.7) that wasn't fully implemented. by the core.  The new buffer isn't accepted in a lot of places where you'd expect it to be.

The good alternative, of course, would be to add this to "trunk" but for some reason that is frowned upon.

See also issue 10211