I'm just curious how you know what an able bodied family spends doing on their day in the parks? Every family sounds their park days in incredibly different ways.
It's been stated that while there were abusers, there are too many people needing a GAC to keep operations running smoothly. It's just not that hard to see when you look at the numbers. In a perfect world a disabled family would just wait a few minutes less than a non disabled family and it'd be all good. Unfortunately, in order for someone to wait less someone else has to wait more. One or two times wouldn't be that big of a deal, but if every family adds an additional 5 minute wait to someone else then just 6 families on a single ride add 30 minutes to someone else. Someone else who also paid the same amount of money you did. Is that fair?
I don't think it's UNFAIR to say, wait your turn doing other things to avoid the compact line that is a given in a theme park. You aren't going to accomplish the same amount of stuff you did with the GAC. Period. But the GAC allowed for disabled guests to far exceed what was possible for a non disabled guest. Everyone can't do everything either due to time or their own limitations or,both. Disney isn't responsible for making up for that.
Your FP waits in addition to standby are no different than traditional FP guests. They get a return time, wait it out, and whatever that FP line is they wait that as well. In your other examples (education, employment), no one else is being effected in order to accommodate someone. That's not the case with a theme park. Sometimes you really can be too close to an issue to be impartial.
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DAS is a tool to let your disabled child experience the park in the way a non disabled guest would. Your experience is line with that. Naturally someone who stays in the park longer will do more things in that time... That's just logical. Expecting to condense a full day into a few hours is not a reasonable request and is not necessary by law. Anyone, disabled or not, does what they can in the time that's allotted. You don't have a personal shopper provided by the grocery store to grab things in the store to turn a 3 hour shopping trip into 1 hour.
I never see any of these types of expectations anywhere but at Disney.