[quote=@The 42nd Gecko]
[@KoL] Honestly, I think many of the Machina's greatest military victories have come from fusion powered machina. I mean, Grafdakka nuking the angelic host with his body was pretty boss. Granted, didn't achieve the objective, but was boss.

Also, Miyu's mechs definitely have their own internal reactors. She wouldn't trust to always have power being beamed to them. And she's pulled a Mini-Grafdakka before.
[/quote]

Fusion power is only for important units. The majority of the faceless rank and file is powered by Eos. Think of the countless mookdroids from Star Wars. If ask of them were autonomous units that would be a logistical nightmare to keep them acting in formation the whole time. Instead they get both power and commands from outside sources to keep things simple.