Hi Pete,
I try to explain it to folk in terms of bread and cake.
Think of the very basic ingredients for some of them. Flour, eggs, salt, sugar, yeast, water, milk etc. Now with that lot you can make basic standard bread, or if you fiddle about you can make a cake, or rolls, brownies, bagles, flat breads, dampers Oh a plethora of things. But you start with a set of base ingredients, differ the quantities and add heat then how you treat them and present them to get different things. Some breads I make could be cake like, when things go wrong some cakes taste more like bread. Then for all you Terry Pratchett lovers out there to whom bread can be a weapon lol. You can vary the different properties to get different end results - but when asked we all know what bread is, and what cake is. Steel and iron are pretty much the same, just different varieties with plethora of capabilities when mixed / treated different ways, same with plastics, wood, people.
But yeah I'm in the high carbon camp mainly as I love the properties, despite the percieved drawbacks. ( But then at Christmas I always serve mincemeat pies with strong cheese and my west coast friends think I'm weird :bluThinki )
Colin.