Agree with you here, BUT to play devils advocate, the 2 times we used
DAS at WDW, we were NOT asked why we needed it. I said "we would like to get a DAS pass" and the CM immediately said "ok, who is it for? I just need to take a photo and I'll explain how it works."
We are primarily DL people and had been asked to explain my son's needs every single one of the dozens and dozens of times we had renewed the DAS every 2 months, for years prior. This behavior at WDW caught us off guard, so it IS very possible the OP had never actually been asked before.