What is being missed about the A16 series backs, is that the 127 film, format is, beside the ability to extend the 120 12 and 24 frame rolls by two-thirds, 33.3%, they give what was for a long time, the very popular choice of 4.5x6cm and 4x4cm framing of the 127 cameras that were so much more popular than 135mm for decades, which Hasselblad also made.
The fact that Hasselblad recognized the need for a 127 frame size., either for the pleasure of, savings or, business requirements of studios and clients, such as art directors, news papers, magazines, etc, simply shows that the market for such formatting was large enough and demanding enough, to justify the production of these popular backs.
If anyone whom dislikes or will no use their A16 back, I would be glad to receive it, and use it, as long already do with my own A16 4x4 CM back.
6x6 CM, aka, 2 1/4 x 2 1/4 inch's, are no the only useful, desirable, worthwhile medium format and this forum's pages are filled with the praise of those other choices.
Why should anyone have bought an other, format camera, just to use some of those alternatives to 6x6?