Or maybe, people have provided the facts and others choose not to believe them or just don't understand them.
I never heard about a sled being connected to the Yeti's back. It is a Thomson Rod that rides in a huge Linear Slide. The sled they are talking about is under his right foot and when he basically pivots near the ride track, it is bearing most of the weight, the rod in his back basically just stabilizes him. His left arm and left foot are just dummy actuators. So he is pivoting on his left and swinging his right arm.
He has a lot of Yak hair(yes, actual Yak hair) on him and adds a lot of weight and other problems with his coverings that needed some repairs, just like all AA figures. But when you go changing the computer program and parameters, and then that shifts stresses to other parts, then it develops cracks in other parts. Then they complained to WDI that it was due to bad engineering and wanted WDI to fix it. When WDI investigated the problems and saw all the unauthorized changes that were made, they said basically that voided the warranty. So WDW/DAK would have to pay for the repairs. So they have a lot of repairs planned, but who is going to pay for it is the big problem!! So until someone wants to spend some money to fix it, it will just sit there.
Yeti's hair is custom made and is composed of three different types of animal hair, only one of which is Yak's hair. Regarding the WDI warranty claim part of the post. WDI will usually only pay for problems encountered during the first year of operation. Yeti started to crack virtually from day ONE! Obviously the problems where not as extensive or severe back then, but everyone on the opening team knew about the issues from the start.