That's also possibly because they may only experience TF. Even if they do both parks and take HE over, Spidey is all the way at the front and may not be experienced in the end.
This continues to baffle me. Universal developed this amazing, one-of-a-kind, industry-disrupting ride technology, and they're only allowed to use it once? What about Dumbo and Astro Orbiter? Pirates and Small World? Haunted Mansion and Under the Sea? And those are all in the same park.