b)I am specifically claiming that while "nothing means anything" is the--lie that tells the truth--summation of nihilism it, by it's very nature, doesn't imply a course of action. So it doesn't matter how metaphysical of a claim it is.
Why shouldn't we be grateful to the totality of our ancestors for getting us this far? Who is to say that we could change even a butterfly wing's flutter of the distant past and still have everything turn out as now?
b)I am specifically claiming that while "nothing means anything" is the--lie that tells the truth--summation of nihilism it, by it's very nature, doesn't imply a course of action. So it doesn't matter how metaphysical of a claim it is.
You know nothing, Jon Snow!
b) If I understand you correctly, I think you're sneaking the assumption of nihilism back into your argument. The "lie that tells the truth" could also very well describe "everything means something," since I undeniably experience meaningfulness as something and not as nothing, despite all scientific facts. Just as I experience you as another soul though I know you are "just" matter. And this undeniable experience of meaning would undeniably imply a course of action. Non-harm (not treating a soul like an object) most immediately coming to mind.
a) Do we know for sure that's what happens to the universe?
and
b) It doesn't matter anyway. "Everybody dies" is only a fact. What does the fact of heat death have to do with the question of meaning? The implication that "nothing means anything" is just as metaphysical an assumption as "everything means something."