Yes - saving a bit of bulk and weight while keeping some limited movements is my point. For me the disadvantage of "standard" roll film backs is, that my camera (Tachihara 4x5) does not have graflock back. And while I do consider to swap it for a different 4x5 camera, it is not a process of saving weight as Tachihara is pretty much one of the lightest cameras out there. So a separate 'light and compact' 6x12 would be preferable.
But once we are talking about the Horseman 6x12 back - does anybody knows the weight?