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I think they figure that folks will mount the graphic side with the examples and use the others for postage.
Exactly what I have done. I have, of course, saved an entire pane as a full intact specimen, but when it comes to placing them in an album or mount, I have taken another sheet, used one side for postage and removed all selvage, etc., and have simply mounted the one side of the pane in an album. It seems to me there is no practical reason to have to keep stamps covered within a mount just because the USPS decides to print the issue on two sides.