If I configure my rules today and then tomorrow I sign up for a new site do I have to amend my rules to also filter the new site? Because that's too much manual management. It's not a lot for a single site, yes, but x10 new sites a month it is too much. It's death by 1,000 cuts.
I don't ever have to do it with Gmail, and that is a tremendous amount of time saved. It is a lifesaver.
You can create one thematic alias and give it as your email to 1000 sites that belong to that category, they all will send millions messages to that alias.
If the email body contains the word unsubscribe, send it to the promotional folder.
One rule to rule them all.