I suppose. But the weird aspect here is the prominence of the button. The point of filtering out spam (given the more pleasant name "Promotions" now) is to put it into a place where it won't bother me. Now, they're suggesting I have a big fancy "Promotions" button at the top of my inbox. Why would I want that button there?
> But the weird aspect here is the prominence of the button.
Whichever tabs you choose to have (and if you use the layout, you choose which of the tabs are active) are available as views into your email. This both makes them out-of-the-way when their subject isn't what you want to view, and available when it is.
> The point of filtering out spam (given the more pleasant name "Promotions" now)
Not the same thing: spam (unsolicited commercial email) is still spam. Promotions are for promotions that aren't spam. The reasons why you might not want them in your normal email box are similar, but the probability that you will at some time want to review promotions for more than "did something get here by accident".