I stopped into my local Cub Cadet dealer about a month ago and was surprised to learn that the XT-3 has been discontinued. He said it wasn't selling well...too expensive! The XT-3 was the last model to have power steering. I believe it was electric. The XT-1 and XT-2 do not have power steering available.
Looks to me like like Cub Cadet has fallen into the same category of machines that you usually see at the big box stores. Before long they won't be producing any of their own machines...just putting their name on something that was mass produced by the manufacturers that make all the other mowers.