On some aircrafts there is a considerable delay between touch down and brake application in case that less than Max is selected on Auto Brakes.
During that time the decceleration is less than it could be if the brakes were applied immediatelly which is the case in Max setting on the Auto Brake.
Also as a consideration, in case that the directional control difficulties require that all the available tyre to ground friction be used for control od the aircraft path the brakes must be released.
This means that the actual landing lenghts will be longer. So if you have a combination of a cross wind and low friction on the runway the required landing lenght should be increased or the cross wind limit be reduced.