It impacts my ability to be flexible in a very obvious way. My routine has always been to book ADRs as soon as I can for every day of my trip based on my best projections of what we will want to do each day. However, if we wake up in the morning, or decide mid-day, that we aren't in the mood for whatever ADR we have, or that we don't want to go to the park we have ADR in, we cancel the reservation. Quick and simple. Now, I can't do that because I have to cancel 24 hours in advance, not the afternoon of. Or rather, I can do it, but it'll cost me $40.
That doesn't seem confusing.