[Kagerou]

I think this is simply a case of plot overshadowing the "realism" of MSLN.

Realistically, between Shamal, Zafira, and Vice, there should have been no problem against the Gadget Drones that went there. However, them beating back the offense would not have worked with the plot, and so, they had to fail in one way or another.

If I were to guess, they probably underestimated the Combat Cyborgs, as well as Lutecia and Garyuu. They were beaten because the enemy blindsided them. It wasn't Hayate's fault.