Its really hard to think of any more overpowered thing in the game.
And if you're making your squad able to tackle tanks with best handheld at weapon in game, why exactly its unfair to make it useless vs infantry?
yea the point is not to make them usefull with infantry but make them better vs tank, 1 more man could help as it means less squad wipes, some other ablity like better reload near tanks and a repair ability at vet 1 (instead of medkits) would give the unit more utility without being blobed for efficency