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Google Inbox had some issues but I really miss two things about it: the ability to make certain categories of email be hidden for the rest of the day or week after you reviewed them once, and the ability to add tasks to your inbox, either associated with emails or standalone.

They said they would fold the functionality of inbox into Gmail but they never did for those features.

Worth remembering that Inbox was created by the Sparrow acquisition. Google hasn't innovated by itself in a long time.

Inbox was a legitimate improvement on "normal" email, and I still miss it.