User blog comment:Jimeee/Skyrim 1.9 beta update adds Legendary difficulty and raises level cap (Updated Apr 8th)/@comment-7297383-20130322221554/@comment-5558140-20130323040301

a number of reasons, none of which i know for sure. they could have been too busy to put up a patch when they found it that was just for that glitch alone because fyi it does cost money to put these patches out, and they wanted to wait until they found more substantial fixes to add to it, or they could have had an issue figuring out how to fix it until now. fixing one problem often creates another.