Unnecessary is the operative word.
I have never had the need for any of that specialized equipment, in forty-plus years of diving in cold water with either dry or wetsuits. A bit of proper planning; regularly hitting the head; and that dry air and activity causing vasopressin (antidiuretic hormone) to kick in, solves a myriad of problems, regardless of water temperature.
All of that glad-handing old crap about "planning your dive" and "diving your plan" doesn't extend to preemptively taking a leak before hitting the water?
Further, any lengthy ride back, in either truck or boat, doesn't then reek like the f**king urinal troughs at Pac Bell Park . . .