My training is in human factors and ergo, look at human machine interfaces, designing for the population, realistic expectations, what humans are capable of, what colors to use, what frequencies can be heard, how we reach switches and controls, how those systems are designed to maximize human performance and minimize errors.

As such a safety professional, I realize that in the heat of the moment, with all sorts of things going wrong, one more thing that is "wrong" is not going to help at all. You say it's "easy" to look over and see that, but in the heat of the moment and with all those critical things, it may not run by the pilots to look at each other's "sticks", they may be concerned about something else that seems more important or further confused by the positions. What if the crew doesn't agree and each one thinks his actions are correct? There are many things that seem obvious when we are analyzing from the ground, but in real life in the situation they aren't so easy to sort through.