This is like saying the Riemann zeta function is only defined for real numbers. You can always extend the singularity mathematically by incorporating new axioms.
My point is, it’s not super meaningful to argue whether a black hole has an inside.
My point is, it’s not super meaningful to argue whether a black hole has an inside.
So does spacetime exist in some frames of reference but not others because those frames disagree on the radius of the apparent event horizon?
Also note that in general an event horizon doesn’t require a singularity.
What I’m trying to say is that there is nothing special about the region of space near the event horizon.