There are negatives, definitely. But to some extent this is just how modern life is - exceedingly complicated. If I want my child to attend a day camp, they need proof of vaccination, maybe a physical, etc. I hear horror stories about the paperwork required when they register for school, lol. Making sure all families have access to timely medical care is a separate issue, but it’s not like Disney is an exception in this area. A lot of things involving children involve getting access to at least vaccination records, a lot of jobs want a yearly physical and TB test, etc. Such is life these days.
As far as what they would submit, I would say at a minimum an educational or medical diagnosis / documentation of the underlying issue. No, not everyone with autism needs DAS. But if someone says they need DAS due to symptoms of autism, then the autism diagnosis could be confirmed via a medical professional or maybe an IEP. Then the typical interview process could focus more on specific symptoms and type of accommodation needed.
Again, I get that this is not a perfect system. I am not in any way shape or form arguing that. In fact, in earlier posts, I actually argued against such a system. But my thinking now is that sometimes the perfect is the enemy of the good. Yes, some cheaters would inevitably still get through. But it would deter a lot of them, in my opinion.