These issues are typically not localized and the other parks are typically experiencing the same issue. Going to a different park also means going to one for which a party has no FastPass+, dining or other experience reservations.
MaxPass is also based in Florida, so wide enough system problems can and do impact the Disneyland Resort.
It happens at least a few times a year. The typical solution is to just assume that tickets are valid and let people enter the parks. The issue of people finding out on social media and entering for free is not really a concern because the issue is typically resolved within a few hours. In order for someone to get in for free they would have to be someone watching Disney-focused social media and be in a position to get to the park quickly enough. The $100 you miss on that one person is less than the cost of just listing to guest complaints.
Exactly. As my wife said. All of those people waiting in the heat for two hours were not the type to have non valid tickets. Best guest service practice should have been to let people in. They are going to spend money. At least until the rush is handled. The angry people are going to spend less money after having to wait as well.