Is that right? Genie recommendations run on push notifications?
Maybe I used FastPass+ differently than most people, but I would modify several times throughout the day. If I pre-booked 9a, 10a, and 11a windows, as soon as I clicked into my 9a at 9:15, I'd pop on the app to see if I could slide my 10a to 9:30. This didn't take more than 60 seconds at a time, and I could take care of it during downtime like waiting for my kid outside the bathroom or if one of the lines slowed to a stop for a couple of minutes.