Lol you seem to be confused about many things my friend.
Let's go through your list...would I rather have metal or plastic trim? Most trim is plastic and almost none is metal. Wood is not metal. And "wood" used in a car is almost always vaneer or paper thin sheets of wood. And either way, if you choosing what trim packag it's based on appearance and function not how much it weighs. Ever. And you brought up cars so let's look at the top quality brands. Lambo, Bentley, Ferrari, Land Rover for example...lots and lots and lots more plastic or composite then metal (outside of the parts required to be metal like engine or tranny).
You have brought up structure and rigidity multiple times in this discussion but diecast does not provide any of that. Zero. Plastic is actually a much better material then dc. There is no advantage in structure or quality provided by diecast over plastic. Not a single one, outside of weight. That's it's. It's NOT more structurally sound. Lol diecast is a cheap cheap cheap metal. It's to gold or titanium or even aluminum as partical board is to walnut or cherry or whatnot. There is plastic in a space shuttle. There is plastic in a Lambo and Range Rover and the international space station and almost any "quality" item you can think about (iPhone galaxy edge or anything else) but there is no white metal/pot metal in any of those products. None of them. So just by your analogy plastic is a far more high end material. It is actually in those items. The exact same plastic. But the same metal from DC figures is not.
Again, there is no product you or I listed (and pretty much none outside of gems and Pm) that is bought because it's heavy. And diecasts single advantage over plastic is weight. That's it. That's it's only edge. It doesn't look better. It doesn't function better. It's not more durable. It's not more structurally sound. It is heavier. Plain as that.
I asked before and you listed lots of things that had metal and that made them better for some reason but that wasn't what I asked. What other product have you ever bought where it was purchased strictly because it was heavier? Because that's the argument your making in favor of it this time. That heavy equals quality. I'm saying show me what you bought that was purchased because it was heavier.