The question to start with is "efficient by what metric?"

This is part of the standard self-flagellation by flagellation between centralized, financially efficient and decentralized, combat efficent organizations.

For example; efficent combat units have organic maintenance capabilities, but financially efficient units have the maintenance centralized at a higher echelon (and company commanders can just get in line to get their vehicles fixed). Same argument applies to any support function I can think of (intel, signal, trans assets, etc).

The discussion of precision guided munitions (PGM) vs conventional munitions was more interesting. I'd like to see a rigorous study of the advantages of PGM vs. iron rounds, integrating the consequences of increased gunnery to make up for less technically sophisticated munitions. That is, does increasing gunnery with the money saved on PGM increase the guns' accuracy and precision to a greater extent than the PGM allows?

This sounds suspiciously like GEN Chiarelli was directed to come to a specific solution and is attempting to rationalize the answer that has been imposed upon him.