After Inbox tho... I went through the 5 stages of grief and started degooglifying my life. Made an okay setup with neomutt (and TripIt*) which I can trust would stay around longer than any Google ad-focused product.
(* I mainly liked Inbox for its travel organizer)
IMO there's too much context switching when your email is sorted chronologically. Much easier to deal with all emails of a certain type at once. You can (manually) organize your email with labels or folders, and go through each one, but it's just not the same.
EDIT: there were other neat features like pinning and snoozing that have since made their way into gmail and other apps, but IMO they worked better with the bundle system than they do without
And location based unpinning. I was traveling between two cities for work and there were certain stuff that I wanted to focus on one city, other stuff in the other (also private stuff at hometown).
Oh my I miss that feature.
Somehow the way it dealt with notification emails was also really good. I was able to keep on top of github notifications and the became useful rather than noise. A combination of the bundling + displaying the most pertinent link and info instead of the subject line.