Tangential to the main topic, but this is the only sensible way of running an email inbox, always has been to me, and it boggle my mind, why would anyone let clutter and a piling number of unreads in their one and only inbox, one of the most important things in our digital lives?
Each email is an action item. If it's not or if it's been addressed, it's gone, period.
Archive vs. Delete is another question but not as important. Over time I've found that I'm probably deleting too much (e.g. where did I buy that <nice thing> 5 years ago? want it again, can't find the order). Then business emails are all archived with the exception of business spam of course.
So why would you have more emails in your inbox than items you’re supposed to act on?