Nor can anything in reality, be exported outside of reality.

Reality is the one thing, the only thing, that cannot depend on anything undetermined or unchosen by itself.

The fact that reality must account for both itself, and any of its specifics, with no other domain to draw from, is a higher level of demand than for any other theory. That demand is a hard and unique constraint. A tautological constraint that is therefore usable as an axiom.