Practically speaking, I suspect auto brakes would actually give a better (lesser) stopping distance on MAX than the average line pilot could achieve with manual braking, especially in adverse conditions. Why? The QRH figures were achieved in dedicated test sessions by using fairly assertive techniques, to put it mildly.
It’s a big ask in a strong crosswind to get maximum braking pressure on both pedals immediately on touchdown and keep it that way to a stop, while simultaneously keeping the aircraft on the runway with the rudder. The geometry is not favourable and I think most people would find it surprisingly difficult...