I beg to differ, of course. Light plate + Armorer sovereign = you'll DEVASTATE in the mid-game.
I have been wondering the balance here, but I hope someone took they're time to look into it
.
I still hope for a content upgrade that adds more armour types and weapons in the tech tree, so mid-game would be more for tactics and less for massing out the best units 
Sincerely
~ Kongdej