What should the DAS guest go while waiting? Disney has eliminated most places to sit, other then restaurant. Shop? While waiting each time for your DAS? Have a cup of coffee, tying up.a table in.a QS restaurant for an hour or more?That would certainly be the ideal scenario, but realistically there is no way to enforce it. Disney would have to start monitoring who is entering standby queues and that would be a nightmare from a staffing/labor perspective and a lack of space/infrastructure.
Most parks have places where a guest can sit in a comfortable chair and snooze for 10-20 minutes. Places that also have movies featuring annoying puppets, robots resembling presidents of the US and an Angela Lansbury short where the audience is suppose to sing along.
DAS is given to guest who have an issue with queues. It makes some sense prohibiting those guests from waiting on any line more then a few minutes. I don't know if enforcing such a policy would be worth the effort.
Disney needs to attempt to reduce the number of DAS, holders assuming you can identify unworthy guests.
VQ is fair to all guests. DAS holdes can a shorter wait after their group is called but the difference isn't dramatic.