My twin sons, Robert and Stephen, 25, work at DSA at Braemar. When the boys were in year 12, transition to work (TTW) organisations began spruiking to us, and they started doing process work at DSA after completing TTW in 2008. It keeps them busy for four days a week, and it's flexible and varied. If we have a medical appointment or want to go on holiday, DSA is accommodating. The disability support pension is my sons' main income, so if they take leave without pay, it makes little difference to their finances. The downsides are that some work may be unpleasant and their interaction with other workers can lead to anxiety and temper tantrums at home. But otherwise they would want to continually buy old electrical items on eBay, which frustrates them when things don't work as they expect.
If anything happened to DSA, we would have to try to arrange other work through Disability Employment Services, which would likely not be so suitable. In general, if ADEs had to close there would be a lot of people looking for work, competing with people who don't have disability. What's more, businesses would find it hard to source alternative places to get process-type work done at a reasonable cost.