Believe me, I'm, no fan of the new system at all. I used it in 2013, had no malfunctions. I just hated the forced planning. The planning I used to do, basically, was list the dates of my trip, pick a park for that date, pick an ADR, and then went on my trip. While there, if we decided to do Epcot instead of MK, no issues. We'd go to Epcot. I'd cancel the ADR for, say Crystal Palace (no issues), and look for one in Epcot (say Biergarten). If Biergarten was not available, then we'd select a second choice. Never an issue. Today? You wouldn't be able to do that. Going on a whim, not following a detailed plan is out the window. If one day we decided to go to DAK instead of Epcot, and have an ADR in Epcot, you have to make that choice the day before, or else you are now charged for the ADR. You then have to hope you can get online, and never mind that, hope you can change out your FP choices to DAK, and have availability.
But hey, Disney is a business, Disney rules, if you don't like it don't go. and Universal sucks!!!!!