Soviet basic infantry also scales bad into late game and they got nothing, same for scout cars and most light armor.
Point: Not every unit is meant to scale into late game.
Indeed. Especially Infantry, that is mainly focused on AI (like AssGrens and Shocks) because this role gets taken over by vehicles and/or artillery at some point.
Problem with the AssGrens is, that they don't even suit into the early game. Schocks can easily survive the midgame because of their armor. AssGrens can't stand against mainline infantry in any way, they even get eaten by Cons when closng in to effective range.