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Actually, I think Bitcoin is more fungible than gold. Specially when you don't have the proper tools to verify the purity.
A common tatics on war/dirty governments was to mix metals to produce more "gold" or "silver" coins with decreasing purity
Discussion
You wouldn't want to funge your good coins with dirty coins.
Bitcoin gets a B here cause of three letter agencies marking coins tainted and preventing free exchange of such coins. Coins are A+ fungible on the protocol level of course.
Hope I get to see the days when bitcoin’s fungibility is unquestionable.