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The Jackson is a TD, even worse, its USF only TD, it needs to be able to deal with any and all tanks medium and above that USF goes up against.
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Because it the only stock TD it does not mean that the USF do not have other tools to deal with meduims.
Their ATG can deal with mediums (far better than the RW), every singe infantry can pick bazookas, paratroopers now get super bazooka, they have access to mines, Sherman can stand up to ostheer PzIV, they have access to M10, even Stuart can assist vs mediums.
The idea that the M36 should completely shut down the PzIV by having extremely high chance to hit and penetrate 20 unit away from its max range and being able to outrun it is simply wrong.
Especially since the arrival of PzIV should mean that Ostheer are finally able to start pushing and since M36 arrival is very close to it.