Like I been saying on FABO for years, a dyno is a tool for controlled break-in, and it is occasionally used by shops a "sales tool" It's the "sales tool" aspect that irritates me...
You should probably tell all the Pro Stock guys how worthless their dyno's are. And their spintrons. And the flow benches they use.
A dyno and a torque wrench are the same thing. You can make them lie. Why bash the tool? I could tell a guy + or - 3 MPH of what his car should run with my dyno numbers. ET is hook.