The Yeti used to move and would grab at the coaster as you flew by as best as I remember. However, the Yeti animatronic proved too heavy? and/or the force of the repetitive motions caused stress on the surrounding beams, braces, and I think the foundation and they needed to stop the motion of the figure to prevent further damage to the ride which would have compromised the structural integrity. Rumor is the costs associated with fixing the show element are too great to implement. So now we get a strobe light instead to have a disco effect but the Yeti no longer actually moves. It's really sad because it was a really well done animatronic and it fit the show and theme really really well. Truly a loss. Glad I got to experience it a few times.
Disney pros, did I get that basically right?