Out of all things that make absolutely no sense written on this forum in this month, this one makes least sense of them all.
That idea is so bad you should feel bad for conceiving it.
No, because that is why ISU overperforms. Maybe you start playing that game?
Even an overperforming unit can only hold the ground if the rest can support its weak spots.
Edit: and when that mean, that the only option to counter the ISU is to dive in, that it should be possible.
It is like road-killing is still a thing. It is simply more difficult to counter soviets support, even if Zis is weaker than PaK40 on paper it has a large squad and Ostheer's tanks suck killing them (beside Brummbär with bad range)