Many people only have a limited amount of time in the parks -- for various reasons, medical/disability or otherwise. There is no particular accommodation required to allow someone to get more done in a short time, regardless of the reason.
DAS is only intended to allow one to do as much as a non-DAS holder who is waiting in queues.
There are posts about how to manage the parks with an immunocompromised individual. Many of the suggestions include:
- speak with your own health care provider about whether travel is recommended, or if they have any specific recommendations for you
- wash hands frequently, preferably with soap and water but hand gel if necessary
- do not touch surfaces unnecessarily (some folks indicate they keep their hands in their pockets for this reason)
- wear a mask, not just a paper mask but a good N95 or such; possibly ask your health care provider for a fitting
- based on your medical professional's recommendation, prophylactically taking some extra vitamins or supplements to help ward off illness
- research crowd levels and use a touring plan to be in the least crowded area of the least crowded park
- Genie+ and/or ILL$ to avoid spending as much time in the queue and lessen anxiety related to that
I'm sure this isn't going to come across the way I hope but here goes... You are willing to spend 8-9 hours on a transatlantic flight with maybe 300-600 others, but you are asking to avoid a 45-60 minute queue while subjecting yourself to 10's of thousands in the parks themselves. I'm not saying that's right or wrong...just that I can see the contradiction in those statements.
As to "defending" yourself -- I think people are trying to point out other options. In what appears to be an increasingly common situation of guests finding themselves denied DAS, many are in a similar situation of needing to figure out how to make a WDW vacation work for them. It may be adjusting touring style, paying for a touring plan, researching, spending money on G+ and/or ILL$.