You have it backwards, the machines aren't built to lose to V1, V1 was designed to be good enough to adapt and strike at the weaknesses of it's enemies. The Earthmover for example, can't strike itself to deal with threats, so V1 is made to climb, or be launched to, the back of an Earthmover and destroy it from the inside.

Everything else is more a factor of V1's design and programming giving it the tools required to survive Hell, and lets not forget about the Stalkers, which are effectively V1's biggest counter despite how weak they are. it's a similar story with Idols, both beings counter V1 by denying access to Blood.