DLR did have that problem, though - there were many days at the end of 2021 that Dream Keys could not get into the parks.
The crux of the matter, and how this whole thing differs from WDW: DLR did not have AP guests when the parks reopened. They'd entirely cancelled the program. When the Keys were first sold, there was no hint of how limited AP access would actually be, and the previous program was unrestricted at the top tier.
By comparison, APs were always part of the reservation system at WDW. Anyone buying an Incredi-pass would have had a really good idea of what they were getting themselves into. (And capacity wasn't as much of an issue at WDW - they were able to massage reservations to get APs through the door throughout the holiday season last year.)
People keep saying that the lawsuit will affect WDW's APs, but that's just not true. The lawsuit is specifically over
Disneyland, specifically over the Dream Key, and specifically over the situation in October of 2021. If the liability issues were there, they would have paused all APs everywhere, including the Pixie Dust pass.
And, honestly, most of the issues being addressed in the lawsuit are no longer a factor now that capacity has eased (and now that DLR is doing a better job of managing the reservation pools - there's almost always AP availability the night before).