I think they introduced that 3 or 4 years ago. There are multiple inbox views you can select from in the settings menus. I do like that system but it's not very valuable to me. I get quite a lot of email but I tend to deal with it all as soon as it arrives.
I understand, but before that was implemented I was really bad about answering emails because so many of them were garbage. Now I only have to look at the garbage if I want to (because I am addicted to massdrop)
