For instance, it is said that the practical current limit of the TO-220 device is 75A. But I frequently see MOSFET devices for which the specified maximum continuous drain current is above 75A. (Examples)
Is there any practical difference between two TO-220 devices such that, one of them has a maximum continuous current of 75A and the other one has a limit of 150A, and all other specifications are same? If there is no difference, why do they bother producing high current devices in TO-220 package and advertise it with current ratings above the practical limit?