5 highly details, 20 ft animatronics. Doesn't matter how many movements they have, they're going to be prohibitively expensive, hard to keep going, and wouldn't fit in the size of the attraction. The yeti didn't have a lot of movements, and look where we are with that one.
Well part of Yeti's problem is the AA engineers were allowed a little too much free reign and made it as big and powerful and bad as it could be without thinking about the repercussions on the foundation.