From that FCC filing it looks very likely that the planned feature of page turns by tapping or swiping the back surface was why Kobo got rid of the soft quilted back and went to smooth plastic on the Aura. Now it starts to make more sense. But we ended up with the design compromise without the feature!
This reminds of the HP TouchPad. Everyone criticized HP for using an all-plastic case when Apple and Samsung were using a metal back on their tablets, and indeed it did prove to be prone to cracks around the speaker openings, but the reason was to allow inductive charging. The inductive charging was a great feature, and HP never promoted it. It was even able to read a unique ID code from each Touchstone inductive charging stand so that you could program it to show different content depending where it was charging (e.g., photos or weather for home, agenda in the office etc.).
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