Units with stupid weapon choices

[BesucherXia]

Glaives and spears are reasonable to be found in the tunnel. Pale ones are not supposed to be highly intelligent, and could fight like human militias, which rely on number rather than skill. And spear is always popular among militias due to its cheap price.
When you are fighting Agartha in darkness like storming their forts, the glaives will appear to be effective. Suffering from the darkness penalty, the agartha can make full use of their strength by wielding glaives. One hit one kill.

Lacking shields is also thematically resonable. In the tunnel it's quite rare to face missiles and need a big shield. Some descriptions in the game have also hinted the Agartha have lost their war against human because they have no experience of those weapons, and only after MA they start to use kite shields.