I'm still confused why anyone would be using the tab system - a good set of filters will do the same thing, be more customizable, and won't take up another 30px

I'm still confused why anyone would be using the tab system - a good set of filters will do the same thing, be more customizable, and won't take up another 30px of vertical screen real estate. I'm also not sure why anyone would knowingly tab over to a big page of ads. (Even with the "Categories" view disabled, Google continues to label my messages for these tabs. For me, though, 90% of the messages under "Promotions" are IEEE bulletins, and the rest are from mailing lists from which I unsubscribe as soon as I see them.) I find the idea of encouraging users to embrace advertising through e-mail to be just kind of gross.