Something others haven't mentioned here when discussing the gmail vs inbox situation is the trio of products, Keep + Cal + Inbox, that make for an absolutely _awesome_ reminder workflow/experience.

IMHO if there's one thing missing from Gmail right now is the integration of Reminders from the other products. It doesn't really fit with the gmail workflow though, so I guess it's just another example of the same 'gmail should be more inboxy/inbox should be more gmaily' argument.