Comment by pmarreck

Probably corps. I was working at Factset in the early 2000's when there was a big push for it and I imagine the same thing was reflected across every Microsoft shop across corporate America at the time, which (at the time) Microsoft was winning big marketshare in. (I bet there are still a ton of internal web apps that only work with IE... sigh)

Obviously, that means there's a lot of legacy processes likely still using it.

The easiest way to improve the situation seems to be to upgrade to a newer version of XSLT.