If you have a USB-to-Go cable, you should be able to attach a card reader and sideload books as needed. In this way you can have your entire library present even if they're not on the device.
As to Google's reasons... I assume that it's a discreet push to promote Google Drive which is their cloud storage service. (Note that Google Drive does not work with Calibre! It will appear to operate alright at first, but you will encounter errors almost immediately.)
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