Earlier quoted context omitted.
The worse it was the better it worked as a budget fudge and it could be included in projections and allow a budget neutral bill to be passed. And by being so bad it would be easier to reverse as fewer people would defend it. There was an attempt to eat their cake and have it too.
Why is it still in place?
In politics it may seem like a good idea to create these time bombs because they can't imagine them going off but sometimes they do and here we are. The pied-piper strategy with the basket of deplorables was supposed to make it easier for Hillary to win 2016 but she didn't so we got the bomb going off instead.