If we want to make comparisons between 'Mechs, would it be easier if we look at real world military vehicles and aircraft? Helicopters Huey (counting unofficial designations) and Hip have been around at least since 1960's and are still in service despite of newer and more capable helicopters being available, like Black Hawk. MiG-21 and F-5 are still going strong around the world despite of existence of more capable fighters. T-55 tank and even older ones are still in use in many thousands (if not in tens of thousands). And can we ever forget Jeep and
its derivatives?
With that said, F-5 and and MiG-21 can shoot down most (if not all) military aircraft by themselves. Even most pimped T-55 (
medium tank) would have very hard time against modern main battle tanks, but makes short work of everything else within range. Jeep & derivatives can be equipped with ATGMs and can give spanking to main battle tanks. And so mentioned equipment can be way more useful than STG-3R against PXH-1. Guess which 'Mech has more uses?
It looks to me that only advantages STG-3R has going for it are smaller weight (for transportation) and smaller price (for purchase), which may result in "quantity is quality". So question is: do we want, with a limited budget, 'Mech lance or 'Mech company? What would be real world comparison? Platoon of Leopard 2 or company of T-55?