Capn Bloggs
Lomapaseo, in my book, skill is the most essential ingredient. You shouldn't need much knowledge to fly these things, either in or out of a stall. I do wonder about the wisdom of needing to remember to trim forward in this situation when you never do it at any other time (as far as I can make out, not being a bus driver).
Aeroplanes cannot recover themselves yet, but it seems managements the world over have let pilot's skills atrophy all the same.
By identifying it as "skill based" shortfall, it sounds like it means that even though they knew that they were in a stall they did not know how to recover from it.
I suspect that ther may be some arguments against this.
and if it requires a "unique" knoweldge of the use of "trim forward" than that would be a " knowledge base " shortfall.