And so was opening Disneyland too early. But what was the alternative? Let's say they decided no, they aren't ready and delayed a week or two. What happens to all those guests who booked trips based on the opening day of Rise? Are they just SOL? What's better for those guests? A ride that they may be able to ride but has downtime throughout the day, or a ride that they have zero chance to ride at all because it isn't open even though it was supposed to be.
I can see the argument either way. Once an opening day was determined and announced, it would be hard to change for that reason.