Absolutely! It's the schedule that's provided to the public should have already accounted for those technical risks/delays. You (not you personally) select a contractor/vendor based on experience/expertise and ability to meet previous timelines. You/we select those contractors that have the highest probability of success given that history (actually, we rated them). Certainly, when you charter into new technologies your risk grows, but that's where a PM team needs to add even more schedule buffers to cover.
Suppose DL SWGE was never given a projected opening of summer 2019 (or whatever it was originally), but was given late fall 2019. But, in exchange for that date being released it had a "complete" opening without any knowledge on any other aspects of the land being completed. I wonder how we'd all react?
I'm not trying to show negativity, as I'm fully confident the finished product will be spectacular, but rather temper expectations on future theme park lands opening "complete".