Want (La)TeX. 'nuff said.
The problem is still here, two months later. I could add some more examples which I've read and written in the meantime, but it seems blatantly obvious that a site for engineers should have better markup for equations than plan text. In fact, it's so obvious that I'm altering the tags on this question to mark it as a bug. The feature exists, it's just not activated, and it's a bug that this site doesn't have [La]TeX.