More cock ups seem inevitable when things are so complicated.
Reforming the benefits system is a bit like reforming the NHS. It's something many people think needs to be done but doing it without adversely affecting those who rely upon it seems to be impossible. Does anyone recall any government being able to significantly change any of it without wasting a whole lot of money and/or causing a whole lot of grief in the process? I can't. The truth is it's all been cobbled together over many decades and the consequence is that it's all become too complicated to manage efficiently.