Make things for warfare.
Mods introducing new content into the game.
New ways to deal with enemies, be it attack or defense.
Krastorio's Personal Robotport 2 and Big personal Battery Mk3 can not be placed into Power Armor Mk5 - Probably lower power armors either. Can it be fixed?
My power armours just use the same category as base game power armors. If it doesn't work in them, then there's not really much I can do.