So in conclusioan, as far as I can round up:
Now imagine that pgrens can have camo to become wipe squad,then they get sprint and also vet 1 extra acc+movement speed,then there are also doctrines that gives them smoke and all of them are not some meme trash but actually good doctrines
Single 20 ammo upgrade allows them to DELETE any squad except shocktroops,they are wall that denies qcq squads like rifles so they can't just rush your grens and mgs and during that they still have midrange dps so this wall is hurts and also they hard to take out in those situations due to their defense
So in conclusioan: clearly need a heavy buff