The simplicity is just one of the strengths that made Inbox a superior product.<p>* Bundles: Made it easy to see all categories of emails from the inbox. Gmail offers categories, but you have to switch between them see each ones.<p>* Task-oriented: The concept of marking an email as Done was genius, and really helped to achieve zero-inbox. At least Archive kinda serve that purpose. You could also mark an entire bundle as Done from a single click if you wanted.<p>* Snooze: Inbox at one point offered time-based and location-based snoozes. Location-based snoozes were great for people travelling between offices without a well-defined schedule. It allowed me to bring back location-specific tasks once I got there, before they canned it. I also noticed it would even sometimes pick up relevant dates and times mentioned in an email and offer you to snooze up until that time without having to manually do it or choose a preconfigured time. Sadly Gmail only does time-based snoozes, and without the custom time feature.<p>* Chronological divisions: The emails were separated by days, so all emails that came today were grouped together, yesterday's the same, and so on. It was easy to see what was from today.<p>* Trips: Having the AI automagically sort and bundle relevant incoming trips together made it easy to find your hotel reservation, plane tickets, etc, and it would even show up a dynamic card with your flight number, departure time, delays, etc. All the useful info was right there.<p>Inbox was Gmail 2.0 and it was great. Too bad Google decided to regress.