I did work experience for 6 weeks in a job centre when I was a graduate looking for work. I also signed on for that brief period and they took on a small number of graduates for work experience, I guess to 'be seen doing their bit' and set an example to local employers. It was eye opening, some people were genuinely using it as a stop gap after redundancy but others were definitely second or even third generation life long claimants. I also lived round the corner from one family who had a lot of children, they were all badly fed, all had social issues, and the eldest at 17 was pregnant and ready to start the cycle again. They had a massive flat screen telly which my family could never afford in a million years. There was no incentive or inclination for any of them to get a job, or go to further education or anything.
The benefits should be there as a baseline emergency stop gap, or to support the genuinely sick.