Two big reasons we built it: 1. the discipline to only check emails X times a day is unfortunately not one that comes naturally to us, and 2. a large part of our job is replying to and dealing with emails, so we still wanted to be able to be in our inbox (to find the relevant information for a current task), but don't want new emails jumping up and interrupting our flow.

So nice, that feeling, when you get through your batch of emails, and knowing you now have 4-5 hours of un(email) interrupted focus time.