epistemic possibility concerns itself with what we can known in theory
@FredWhat do you think an "epistemic basis" concerns itself with?
why would entertaining the possibility that we're living in a simulation truly matter to us, philosophically speaking? To what extent does speculating on any metaphysical possibility matter?
If I'm understanding you right, you're defining epistemic possibility as the mere logical possibility that we could know something. And this differs from feasibility because while it may be possible for us to know something in the logical sense, it may not be possible in the practical sense because we might lack the practical technology or ability to figure it out.
If I'm understanding you right, then I think it IS epistemically possible that we could know that we are in the Matrix. We could know it in the same way Mr. Anderson found out. Morpheus could visit us. Or the software developers who wrote the Matrix could tell us. They could program the knowledge into our minds. Apart from something like that, it may not be feasible for us to figure it out, but it's still logically possible that we could know.
Taking philosophy to be the project of trying to understand the world and the nature of reality as we find it, epistemic possibility concerns itself with what we can known in theory. If aliens exist somewhere out there in a distant galaxy, it's epistemically possible for us to know if they exist. It might not be feasible (due to time, distance, and technology), but if feasibility were of no concern, it would be easy for us to know (one way or another) if aliens are real. But suppose we are living in a simulation, which is quite conceivable (based on the Matrix movies), and it's logically possible. But here's the rub: is it epistemically possible that we could know this to be true? I can't imagine how. So why would entertaining the possibility that we're living in a simulation truly matter to us, philosophically speaking? To what extent does speculating on any metaphysical possibility matter?
IMO, we take a very important lesson from two very different areas of human thought; classical theism and contemporary phenomenology and cognitive science.And that lesson is that epistemology and metaphysics are not independent thoughtforms. Acts of knowing, imagining, thinking are part and parcel of the metaphysical fabric of the world.
As a theist, in order for me to convince a religious skeptic that God exists, I have to falsify atheism.