Bjorn, thank you for the eloquently making the point that I was going to make. I am a big guy and can shoot 65 or 70 lbs. I am also steadily becoming an older guy and want to keep my shoulders in one piece. I shoot 55 lb bows by choice. By changing and optimizing my set up I gained 10 fps, quieted my bow, and gained penetration thru better energy transfer. The extra 10 fps is the equivalent of shooting a 60 to 65 lb bow depending on design of the bow. For me it is a matter of personal ethics to shoot the most accurate bow I can with the most efficient set up I can.
If we all held to any fiddling or new thing was not traditional, we would all be shooting self bows, knapped heads, and self made arrows. If you shoot a modern bow with glass or carbon in it presenting an argument that looking for a little more speed and efficiency is not traditional seems a bit off. Modern limb materials are exactly what makes modern bows faster and more efficient than "traditional" bows, and most of us seem to love those wonderful modern designs.
I say to each their own. If you're a fiddler like me, then have at it and enjoy it. If your not a fiddler, then stick with what works for you and enjoy shooting what you have in hand.