This is true. But it also means many are not racing from attraction to attraction.
As another poster pointed out, the disruption in their normal routine might equal half a day in the park, or maybe they only do the peripheral park hours.
It has also been pointed out that families often have more than 1 child. WDW thinks DAS needs to change, and hopefully the new options are better for everyone, but well, a close friend of mine was other child. Every day of his childhood was impacted by his sibling's needs, and her needs were all-consuming. If his sister could only be in a theme park for half a day, that likely meant he could only spend half a day in the theme park. Though I should add, his family never went to WDW. His family was only able to take half-day trips to local amusement parks. Overnight trips were not an option.
I daresay, WDW long ago took a compassionate approach in the days of GAC. Much has changed since then. Am I the only one who recalls The Year of Million Dreams? CM's gave out all kinds of freebies in that era. No matter who you were, CM's were extremely generous to everyone. They gave out all kinds of freebies, just because. If something ever went wrong, like ever, CM's would make it up in some way, like a free dessert or magically replacing a lost toy with a new one. If you were the first one to enter a gift shop, you got a certificate.
Indeed, crazy to recall, but that was part of why I joined this forum way back when. I thought it was fun to hear about all the creative surprises. That was a different era for sure.