I agree with this - young engineers typically do not appreciate the importance of building the right thing vs building it well. However, the OPs point stands. McKinsey and these other companies just regurgitate what is printed in the trade press and charge you top dollars for it. You meet an experienced person once at project kickoff, and then most of your contacts are fresh grads with 2-5 years of experience. They really specialize in attending meetings and conference calls, but are all over the place (from excellent to awful) at actually implementing things.