I get the feeling that this is a MVP or feature test for something bigger. Because truth be told, I don't see why people would care about someone's inbox health, especially since people use their Gmail account as a garbage dump+todo list+backup. I've seen inboxes with THOUSANDS of unread email and most people I know don't archive anything at all.
An interesting idea, but one I'd disagree with almost completely. Email works extremely well for me because I can receive it regardless of my availability, and respond to it when I have time. Your blog post notes that email interactions don't match real life; I agree, but I'd consider that a feature. I can easily solve the "important people" problem by using filters to call attention to email from those people, but I'd only need to do that if I couldn't keep up with email in the first place; currently I can see at a glance who my email comes from, and optionally cherry-pick mails to respond to first. Otherwise, to the extent email becomes more like real-life interactions, it becomes less useful to me.
> I've seen inboxes with THOUSANDS of unread email
Is(n't) this 'bad'?
I avoid email in some circumstances because people don't seem to use it well (Admittedly what is meant by 'well' can be subjective). Most of them have hundreds/thousands of unread emails.