Jagd and Elefant have the longest range, massive damage and great frontal armour/hp (penetration is always). Stock tank destroyers can't counter them since they will die in a couple of shots. On most maps they are un-counterable. Maps where you can send in tanks to flank it are Steppes, Whiteball, and similar open maps. If you want to field and Elefant and you know your enemy has the combo, it's your decision. Besides, that combo hasn't got 100% success rate. You spend a ton of munitions and one good tank to kill a heavy tank. That's a trade.
People seem to not understand that Elefant and Jagd are high risk (due to high cost) and high reward units. They can easily put to shame and tank there is. If you're a capable player and you can manage it, you don't have to worry about T34 ramming it since a good player will keep it in the last line. Behind shrecks and MGs and other tanks.
And of course, the critical is dictated by random function.
It's a good combo that should be left as it is. It's seldom used and hard to pull off and it's not 100% H-TD death.
and now imagine you see the big tanks from allies like ISU and IS2 and so one...and all u have are low penetration TD without turret and even only 50range....or get panthers...which are outranged by ISU easily. and well...there are zis walls, penals, and SU85 too...