That's exactly what we're doing. Obviously I don't believe the initial conditions of the universe were set 6000 years ago, and just look billions of years older by mere coincidence. My point -- directed at its parent comment -- is that we can scientifically prefer one hypothesis over the other, even though they're indistinguishable by any experiment because they make identical predictions.
Instead, we can use other forms of reasoning, such as probability and Ockham's razor. These are perfectly valid approaches.
You seem to agree with me on this point, so I direct your attention to the grandparent comment:
> I'm interested in logical arguments for why I should be convinced that something completely impossible to ever test, not even in theory, is correct.