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An argument that modern body armor has largely negated the incentive does not imply that the ethical concerns don't exist. They are entirely separate points of discussion.

> You can argue that any GSW that isn't immediately lethal inflicts suffering, I'm not sure how an expanding head changes that.

It's a matter of intent and degree. If we collectively threw up our hands every time we encountered a grey area we'd never be able to agree on anything.

The point is that in the event that a weapon fails to kill the target, there are ethical concerns if it does more damage, particularly long term damage, than absolutely necessary. There's no need to make warfare even worse than it already is.