1)If you lose the map control the faust is useless
2)If you retreat after faust i don't see problems
3)t70 isn't free, it needs fuel and you know that probably no there will be su85 after
4)So while t70 is blocked you get a p4 or a stug
5)When multitudes of bolsevics will rush for anti tanks bomb, you use a strafe and rush with flame ht
Faust is sort of useless since the range nerf; any half-competent Soviet player can just micro his vehicle out-of-range while tearing up the Grenadiers. Unless you're catching an enemy vehicle by surprise and he doesn't see that faust coming, you're going to have a really hard time getting into range without sacrificing most (or all) of the squad.