Thanks for the valued insights, Tom. Based on your explanation it does make sense to me that the additional rotating mass can have a positive impact on bass response, which is what I have heard when I moved to a table with a much more massive platter. I suppose that in a similar fashion a more massive plinth has the same effect, being that it is more solidly "grounding" the arm and bearing so that the stylus has a better chance of translating all of the information in the groove.
I do understand your meaning in the quote from you that DougDeacon referenced. I think so many times we just engage in bench racing here on the forums, it is fun, but sometimes we loose touch with the reality that nothing is perfectly defined or modeled and certainly nothing is perfectly implemented. Perhaps I have an advantage in some small way because I don't fully understand what all of the tradeoffs are and how they impact the sound. Well advantage probably isn't the right word, ignorance is bliss is a better description of my current audio prowess. But I do love music and I get very excited each time I open a new door in this hobby. I just have to take a bite of the apple but it seems there could be a price to pay.