Reminds me of a thread I saw on the Google Inbox mobile app a while back. Brilliant app, but no 'unread message counter'. There was a huge number of people on the thread begging for that feature and going so far as to say that it was the one thing that prevented them from using the app. Their thinking was apparently that you should have filters for everything and it all should've fallen neatly into little boxes, but for people that have been using email 10 times longer than those developers have been out of college, that's not very practical. One G dev chimed in and said 'But that's now how I use email' and closed off the discussion.