Paraphrasing Gums I can say ..
All that being said, I still have a problem with several accidents where basic airmanship played a larger role than mechanically or not mechanically connected controls
And paraphrasing Dozy I can say ..
Indeed - and truth be told there has not as yet been a single accident in which connected or not connected controls could definitively and provably made a difference.
So that being said and accepted as irrefutable facts ! .. it is obvious that there is one who handles these commands that will be able to make the difference between a flight that ends normally or crash
Conclusion .. the problem is more than often the pilot(s)