I am missing some 'allround" units/non elite,
Something like Marines, hydralisks or Stalker in Starcraft/2, units that are relativ cheap and can be used in mass on every kind of unit types,
i had 8 squads of scout marines and could barley scratch a building, espacialy in late game esclation 4 its anyoing, the same for eldar asuryan, there should be at least some late tech upgrades like in starcraft to make t1 units usefull again, like zergling had adrenalin rush to incrase atack speed, or shells to incrase atack range or damag in dow 1 you had something similar, with granades or so that wasnt super effectiv but in mass was enough to burn down a building or to kill a vehicle even if youre infantery lost a lot.
Just as idea to be able to switch the cloaking device for energy shild to at least use them as meatshild.
Command and Conquer had that too with Mortar upgrades for Pitbull (rocket vehicle) as example anti air / vehicle beeing effectiv against infantery etc.