I totally disagree. First of all, there is a breadth and depth of knowledge to operate an airplane. With the glass cockpits, we don't need to know how any automatic system operates. There are so many hybrid systems that within a 5 year time frame of manufacturing, the differences within the same system are totally different (eg. electrical system on the 757/767). There is also a cost to teaching these systems. If you bring in mechanics to teach systems, you'll end up with knowledge way too deep and way too broad. We don't need 6 week systems training. Additionally there is an acceptable level of risk in the operation. The FAA defines it at 10 to the minus 8 which means any error that occurs at that level is acceptable (UAL 232-Iowa City comes to mind).

As a pilot I don't like that reasoning but if you want a zero accident rate then don't fly the planes. We run over a ramper once every 5 years and that's before the plane even flies. By far the largest cause of accidents is flying. Robert Sumwalt and NTSB says the two primary reasons is: failure of the crew to manage disruptions and distractions and failure of the monitoring pilot to ACTIVELY monitor the PM.

I think your concern would be better placed in the new grading scheme used in 2011. For the first time, your CRM will be graded and you can Fail for CRM even if you do the maneuver correctly.