I think that oft-repeated tenet from Shigeru Miyamoto about game design applies here (given that this is largely a game) - a delayed game is eventually good, a rushed game is bad forever.
(Of course, this principle applied more acutely before the advent of remote patching tech, and obviously Universal will make adjustments as more real-world guests provide feedback... but at this point, internally, they're aware there are issues and would prefer to make changes before the public experiences it.)