Its just simpler and more efficient for a line to focus on their target demographic, which is why you see most cruise lines, or in fact most attraction industry companies, tend to stay in their lanes. All the marketing money is poured towards getting the target demo to look into their product over others, not to mention the millions in R&D and license purchases. Those who really want the sort of experience you describe simply don't look at RC for their needs, and so it doesn't quite make sense for them to spend the massive investment that is an Oasis-class on targeting a demographic that isn't part of their marketing strategy.