No doubt their IT systems could use some work. (I also happen to work in IT as well), but to your point, does
Amazon have the "Ebb and flow" that Disney does? Are people on Amazon waiting at the stroke of 6 AM EST to log in and order the latest Kindle? Sure, sometimes, and sometimes they have an issue. Disney gets this stuff EVERY DAY, because people can make their FP+ 30 or 60 days out and people can make their ADRs 180+10 days out. Since people are constantly "Attacking" their system (ok not really attacking, but hitting it) to get their ideal plans coupled with normal traffic, coupled with the fact that it's EVERY DAY, coupled with the occasional offers like Free
DDP, it's definitely a challenge.
Again, I am not trying to say there isn't room for improvement, but that I understand the problem and it's not always a simple fix. Often times in IT when you fix one thing, you break another, so fixes and patches are time consuming PLUS many corporate organizations have other "hoops" to jump through to approve such changes.