By this logic, why test? Just roll it out, because feedback from any test won't fully represent full rollout conditions.
As others have said, so much data has got to be going into this: aggregate historical data from decades of running parks about crowd patterns, satisfaction, etc.; testing feedback - under changing conditions - in the current FP+ incarnation; feedback about POSSIBLE differences post-rollout vs testing -- ie testers being asked in focus groups how their opinion would change if they got rid of legacy FP system. I wouldn't be surprised if they also draw some on these boards and their own social media sites as well, and factor in feedback from those who write in.
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Then why have you been crapping on people for complaining ?
And, as a researcher, I very well understand the concept of theoretical testing, or theory crafting, which is actually what people are doing on these boards, and its valuable, which is why, again, I can't understand why you are basically poking fun at people complaining here. If you are testing in an abstract situation, one removed from actual working conditions, then there is no external validity to the test, there is only internal validity. You then have to attempt to create linkages to real world function, and hypothesize outcomes, but that's all they are, "best guesses" of outcomes.
To a certain extent you are correct, testing in abstract or controlled environments is not worth much for a system such as this.