this doesnt mean, that such a flame vehicle wouldn't do any dmg to a tank. IT would be indeed make serious dmg to a tank. It is even a really good weapon vs tanks in close combat.
It was clear that you have no clue, what happen when this flames would fire on a tank. Maybe read about it. Learn everyday something new.
Oh, sure it would and sure it did IRL.
But if you want to go this way, we'd have to make flame nades/molos effective vs vehicles too.
The only thing that we have clear here is that you have no slightest idea how to tell immersion from realism or are unable to wrap your head around the fact that coh2 is an arcade rts and things aren't supposed to work as they did IRL, because if they did, you would see PTRS units completely messing up tanks from the side.