This assumes that any party to a conflict chooses to use their nuclear arsenal. In WW2, both sides had chemical weapons but chose not to use them due to concern

This assumes that any party to a conflict chooses to use their nuclear arsenal. In WW2, both sides had chemical weapons but chose not to use them due to concerns of reciprocal strikes coupled with a perceived limited utility. We could be entering a world where there is always a military alternative to nuclear weapons, leaving nukes in a state where their only utility is as a deterrent against another nuclear power using them.