eolesen,
Physicians Assistants do not, by and large, perform surgery or proscribe medication; Legal Asssitants do not Litigate or file Appeal.
While an individual below the level of an A&P may be able to perform individual tasks more economically than any particular A&P Mechanic, they cannot have the understanding of how their task performance will impact the overall performance of the airframe without the knowledge and skill set imparted during the training of an A&P certified mechanic.
The certification of individual skill set for Avionics, Sheet Metal, Composites, Electrical Distribution, Hydraulics, Pneumatics should be based on prior certification of the individual for the Airframe and Powerplant Mechanic due to the downstream impact their performance will have on the certification of airworthiness.
"Dumbing-Down" is not the answer to increasing the margins of aviation safety during a period when overhaul is increasingly sent overseas, outside the requirements and scrutiny of domestic regulation.
Raising the bar to entry will increase the prevailing wage as it decreases the population capable of both passing the requisite entry due to performance and background: while preventing the diminution of standards and accountablility neccesarily required for increasing the safety margins as newer generation aircraft are deployed with structures and systems that are different from the older generation airframes.