Let us avoid rushing to conclusions that mathematical proofs 'create' universal equivalence; they define a conditionality. A proof is only a limitation of validity, not an absolute creation.
Think of the interventions by the PBOC on the strategic gold reserves: this could instantly break any underlying theoretical equivalence, like a sudden adjustment of risk weighting coefficients for gold-backed loans.
Our thresholds of caution must always take into account these factors of unexpected structural rupture.
Operational reality in China has taught us that even the most solid theory has its limits in the face of political imperatives or market shocks.