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Presence of turret doesn't make jackson have different role then SU-85, both are intended to hardcounter everything that isn't an infantry and both are vulnerable to a flank(just one can attempt to defend itself, but it'll still die as P4 shoots faster and panther will outlast it without any effort).
But katitof, you know that the turret on M36s allows them to reverse and aim and also its high moving acc enables them to deal more damage to the diving tank than the later mentioned one.
Its weakness (being flanked) is more like a trap instead, any other TD would have already lost the fight.
There is a double risk in hunting M36s than any other heavy TD and they also outperform panthers (wether we like it or not everyone uses them as a benchmark).
Make the sum: +1 great range and pen / +1 moving acc and speed / +1 fast repairing with crews
(Only if) -1 Too reliant on mobility (but so does almost all tanks)
Any other TD will have at least one flaw (Su-85; FF; M10) and costs for Jacksons is not comparable to panthers if they were to be nemesis, even if we lay out the entire teching and opening for US/Axis.
Panthers do put up a fight but they have fair disadvantages and they share one with M36s, being outnumbered.
Other solution would be go give stugs a long range snare. With no mobility jacksons become quite vulnerable.
My point is, a good unit withouth vulnerabilities its too dominant. The only viable solution is doctrinal heavy TDs for axis and they have been nerfed quite much and most commanders are out of the meta now.