One last point to remember is the DPE usually has less than two total hours in the plane to run through a rigorous set of maneuvers and evaluate a whole catalog of knowledge and judgment elements. The recommending CFI, by contrast, has 40-50 hours of time with this person and must be the true arbiter of excellence. DPEs are also strictly forbidden from handling the controls to demonstrate or teach from the right seat during an evaluation. The current FAA guidance on this point is very clear and has led to the removal of many DPEs. You will not find any “added value” imparted during a flight test from the senior aviator in the right seat; that is FAA policy!
Your input on this issue is certainly welcomed here in the comments (and by the FAA at this e-mail). I know there are professional aviation educators who think the ACS and some of its requirements are too stringent and restrictive; “we are making aviation too expensive and difficult.” This could be an indicator that we are at a good point of compromise (and everyone is equally unhappy)? The real news here is ultimately, the professional aviation educator is at the heart of aviation safety and assures that every pilot is thoroughly trained and safe. Fly safely (and often)!