In real war it has never proven to be the case. All wars has always won by quality of troops and equipment over sheer numbers. You can take this back to as far back into time as you like and it still holds true.
I only need to take it back to Korea. The Chinese would have won, and should have won, except for the “Korean haemorrhagic fever” (hantavirus) epidemic, that lethally decimated the Chinese side, and incapacitated far more.
As I said, it is a balance.
I don’t entirely agree, Steve. WWII, Germany had some very high-quality equipment, particularly armor. The main method of defeating Panzers by both the Americans and Soviets was just to pour more of their own armor into fighting the German tanks than the Germans could handle.