This looks like it's optimized for senders, which are on average advertisers or companies trying to drive engagement or sales.

This ignores the average user problem, which is getting real communication lost in the mentioned sauces. I say that because big bucket filtering is almost always circumvented by email campaigns. I was an early user of Gmail when they introduced this feature, and almost as soon as it was useful it was not, because advertisers figured out how to play the game.