The title sort of says it all.
Aren't Determinism and Free Will indiscernible from the mortal perspective?
Under Determinism if I don't know what the plan is then whatever I do is was and always will be whatever I was always going to do and have done, so it makes no difference. From my perspective (determined or not) I'm making choices, though potentially some entity somewhere with enough data could theoretically predict my choices with absolute precision.
I found a question that I believe hits on the same nerve however I'm specifically looking for answers that express ways that we might probe reality in order to separate the two, and not so much wanting to decide if such an idea as "freedom" matters or not.
I recently found a name for the running theory I have about the "entity with enough data" model, Laplace's Demon.