Paizo is publishing slower than WotC did during 3e
They are? I thought Paizo published more than Wizards - at least in terms of number of products, if not in terms of pages.
Without digging too deep, I found a list of products they were publishing Fall 2015 (August to October) - 11 products, not counting flip-mats, Adventure Card Game, and the like. Extrapolating that to a full year gets you 40-50 books. For a comparison, Wizards published 25 books in 2005 (which I think is a fairly representative year). So Paizo are publishing nearly twice as many books as Wizards did - though the page count is probably similar.