When I worked for an airline, we had a couple of DARs. They had the credentials to approve designs and changes to aircraft. But more times than not the designs were only a nice picture, and could not be implimented. When you as the LAME had to install or modify the a/c as per said drawing, you would find that is was not workable.
I'm not a CEng or a IEng, and I have great respect for many of them, but the problem that I have is I have to work on many of these designs made by someone in an office, who doesn't put much thought of maintaining his/her design. When I have to fix an a/c, it normaly is dark, cold, and oily. Half the time it is as if the bit you are trying to remove was put in first, and the whole structure was built around it. Makes it hard to do a turn around, and clear that tech log snag in time for the next flight, and many times I have found that the structure was mangled by the last poor guy who was stuck fixing the machine in less than ideal environments.
I don't care what title a person holds, I just think they should spend some time twisting a wrench before they are let lose to come up with the next great design.