>has no upside at all Basically any powerful/impressive weapon can be justified to have upside as it might reduce further casualties by ending conflict sooner.

>has no upside at all Basically any powerful/impressive weapon can be justified to have upside as it might reduce further casualties by ending conflict sooner. And looking at trench warfare, if there had been a way to make it completely unfeasible by being able to "permanently" poison an entire field at a time, perhaps that would have turned out better.