I would think you’d focus on simple impact. Armor doesn’t fully protect against that, so if you hit hard enough with a sword, it’s still going to hurt like hell, maybe cause serious injury.

Like how bullet-resistant vests work. Depending on the tech in the vest (and the round), you’re still getting injured - perhaps enough to keep you out of the fight.

A good example is modern helmets (both motorcycle and bicycle). I got a concussion while wearing each of them. They kept me from having a more serious brain injury or even death. And my helmets work far better than what this guy is wearing.

This soldier getting hit in the head is still going to feel it, maybe even knock him out or kill him.