I don't disagree that each satoshi has a history but I do disagree that 1 BTC =! 1 BTC. If you're using Bitcoin correctly that history can not be tracked and thus re-establishes the fungibility of your coins.
I would happily accept any Bitcoin in exchange for any other Bitcoin.
It's kind of like Zcash.
One of @dollavigilante's cases is that the only truly fungible coins are private by DEFAULT.
Posted via D.Buzz