Because the competitive landscape of the web is such that the site which looks and works best gets the most traffic, developers and designers put a premium on the presentation of that content and let structural markup take a back seat.
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“Nothing is as frustrating as arguing with someone who knows what he's talking about.”
“Unfortunately, we are not painters and authors, where we can do something in isolation. We require a lot of money to create what we create. It's almost like being an architect: You can't be an architect and build whatever buildings you want to.”