The problem wasn't that TBA was a new story, it's that it's a completely
lame story.
It would be as if they made a ride for Frozen based on
Frozen Fever.
They had the elements in the ride system itself and in characters/themes from the original story they could have built on to make a great PATF 1.5 but chose to punt because they wanted to make a feel-good "princess" attraction out of the bones of a thrill ride and part of that required removing any sense of tension or suspense leading up to that final drop since they couldn't actually remove the drop itself.
PATF should have gotten it's own dark ride where a real story could have been explored and if SOTS absolutely had to be scrubbed from existence, they should have come up with something they felt comfortable adapting to the thrill ride this "mountain" was always intended to be.