Your timing advance is dependent on what plug type you use.
More advance is higher for the plugs. More retard is lower on the plugs.
In that way it is dumb. The arbitrary numbers that you have listed for advancement after said spark plug also is pretty dumb.
That link or quote does not back up much if any of the stuff in your post. I THINK what your trying to say is that a platinum tipped plug or a iridium tipped plug will withstand the hotter temps associated with a more advanced engine.. While this might be true(to an extent), it has very little to do with advancing timing on an engine. EGT's and knock levels tell you how far you can advance an engine, NOT your freaken spark plugs. If your running NGK coppers on a highly tuned high EGT running engine, its a given your going to be replacing your plugs often.
Excessive EGTs are going to damage any spark plugs in the same way a copper plug would be dammaged. A plug is more than just the center electrode. Heat is going to destroy the ground electrode exactly the same with whatever plugs you use. Both parts of the plug are equally important.
You dont tune an engine around the type of electrode you choose to use for your plugs. PERIOD.
Modified by 480sx at 9:58 PM 7/27/2008