I believe this has to do with weight. By having a limited number of larger seats, the number of larger riders that can ride at a time is reduced Even though it is unlikely for a ride to be filled up with larger riders, a ride still has to be designed for that unlikely condition. No one would be happy if the ride stopped on the lift due to an overweight train. Of course, the ride could be built to take a heavier train, but this adds substantial cost to construction.
Plus, when the weight difference between an empty and full train is increased trims are needed to keep the train running at the precise speed intended. And as enthusiasts, we all know that trims are evil. :-)
Tony has confirmed it is a tunnel, splash down, and monorail. https://twitter.com/TonyClarkCP/status/712311454448222210 (yes, I realize this is sarcasm).
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