I think there's a culture with modern developers that says using older, less sexy technology isn't going to work as well as newer, sexier technology. "Cache HTML?! That's so inefficient!" Yeah, it also just works, too. When all your databases, content engines, storage services, deployment tools, etc all take a crap, your clunky little web proxy cache keeps right on humming and your customers get at least a half-functioning site, if they notice at all.