When engaged a freewheel places no additional force on the threads than a screw on sprocket, no?
As long as the tooth count and chainline are the same, the driving loads are the same, and a freewheel doesn't have the load reversal problems which can affect the interface between a fixed sprocet and the hub.
As long as the tooth count and chainline are the same, the driving loads are the same, and a freewheel doesn't have the load reversal problems which can affect the interface between a fixed sprocet and the hub.