Missing the eighth or tenth meeting invite because it was auto-filed as an 'update' and never notified me, as well as similar experiences with messages I consider 'important' put an end to Inbox for me. I did first try 'training' it by moving things where they should be, but Inbox never changed what it did.
Yeah this machine learning and personal assistant tech is on the ugly side of the uncanny valley right now. When we have the Star Trek computer then I'll get on board, but right now apps like Inbox flat out create more stress than save time.