I don’t need to know the value of their limit, I just need to know their bounds. Just like a prison doesn’t need to know the strength of each inmate, just that they can’t bend or bite through steel bars.
Cryptography is real, physics is real, networking requires a substrate, CPU clock cycles are real, magic is not real. I think those are pretty reasonable premises.
Imagine 200 years ago saying the same thing. As if you have any idea the limits/bounds of anything. Especially in the face of a super intelligence, it’s absurd.