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I admittedly don't know much about email clients/addresses so there may be an obvious answer to this, or even that it is already is possible, but why don't email addresses allow you to specify paths that link to folders in your email.
If I go to a website at example.com/path1 it I am saying I want to access the site at address "example.com" in the directory "path1". Why can't that same idea be applied to emails, if I sign up for my bank account with email "example@gmail.com/banking" I'm saying send that mail to the address example@gmail.com in the folder "banking" and it would put the mail in the banking folder I have at that address.
The only reason I can think of is I believe those folders may be tied directly to the client not the address itself but it seems whenever I link my mail to say my phone "mail" client all the directories come with it?