Kobo has built-in categories Unread, Reading and Finished. Books get sorted into those automatically.
As to Calibre being an additional step in sorting... not with Kobos. Once you've sorted/tagged the books in Calibre and connect your Kobo, all the categories get automatically uploaded to the device when you send the books over. That means you won't have to do any manual sorting and category creating on the device. After disconnecting everything will be already sorted and categorized. AFAIK it should work the same way with Pocketbooks, but I've never owned a Pocketbook, so can't say for sure.
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