Indeed, it seems that the FAA are proposing that it is fine to fly in effect with MCAS disabled (AOA disagree) or crippled (only one activation) - in which case why it there in the first place?
Many failures of safety and envelope protection systems result in them being locked out for the rest of the flight following a sensor or computer malfunction, you normally can't dispatch without them but if they fail in flight you continue with appropriate mitigations.