Here the fuel is already being used as a heat sink to cool the inlet air. Liquid H2 doesn't have that big a heat capacity, you can't use it cool the fuselage an

Here the fuel is already being used as a heat sink to cool the inlet air. Liquid H2 doesn't have that big a heat capacity, you can't use it cool the fuselage and the cabin air and your cocktail and still expect it to keep the engine from melting.