What about 3 new folders among Unread, Starred, Snoozed etc called Today, Yesterday and 7 days (or a better name for it)
I receive about 100 mails a day and in my workflow I would like 3 folders filtering out all the mails I receive today, yesterday and in the last week, or 7 days, in all accounts together. It would make it easier.
In other email applications you can make smart filters for all accounts together, but not in Mailspring. This would be a solution.