Even Ford talks about locking out higher gears when the truck is heavily loaded or towing on grades in their Selectshift tutorial on how to use the feature. So that tells me that not even the Ford trans doesn't know how much you are towing or at what grade/terrain you are towing in to always be in the right gear. Hence the reason why they leave it to you to choose what is best for your truck given the conditions. As is said before, you are giving your transmission too much credit. It is not that smart.
SelectShift® Automatic Transmission
