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. ↗
There's this very vulnerable planet of ours with finite resources. Architects and designers have, I think, a fair responsibility for conserving energy and materials, and making things durable. ↗
I do think I know more about clothes than any 500 designers, because there's nothing like wearing them. You buy them, you study them, and you start to understand how they're crafted. ↗