Please don't think US-centric, think worldwide as a camera manufacturer has
to do. The key points involved in this case are:
1 - Camera manuals are developed together with cameras, before they actually
go on sale. For that reason, marketing decisions taken afterwards aren't
reflected in the manuals.
2 - Usually, Pentax develops different manuals for Japan and abroad, while
many pictures can be shared among them. So it is possible a data back shows
up in a picture for a camera intended to be on sale worldwide without a data
back. Not the best thing to do, but possible.
Among the reasons for making different manuals, sometimes there is
difference for standard equipment and optional accessories.
Often, the data back was included as standard in Japan (and possibly other
markets, for some marketing strategy decided after the manuals were
released).
Summing up: the international manuals were mostly developed thinking of
cameras WITHOUT a data back. However, in certain markets those same cameras
were sold WITH data backs as standard equipment. That was a marketing
decision, not a design feature.
BTW: my Z1 has no data back.
Dario
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