As an axiom for discussing our observable world, sure, it's pragmatic. But it remains an assumption. I wouldn't dream of suggesting cogito ergo sum isn't an ass

As an axiom for discussing our observable world, sure, it's pragmatic. But it remains an assumption. I wouldn't dream of suggesting cogito ergo sum isn't an assumption. On the contrary, it's a very shaky assumption. The passage of time is a more reasonable one, but it's still one we have no evidence for. It's reasonable to assume, and so allow us to talk about the passage of time even though we have no conclusive evidence for it, but that does not make it reasonable to claim conscioussness requires a dynamic system, because we don't know and can't know, only act as if it does.