How many stock axis vehicles will the Jackson struggle to pen? How many will the SU 85, or the Firefly? And why are we talking about stock vehicles? How often do games get finished without picking a single doctrine? It almost seems like you're purposely diving into semantics in order to
Why should they struggle to pen? They are fucking tank destroyers, if they can't penetrate armor they are literally useless
As Dark said they are too strong against mediums where penetration is not a factor, not late game heavies. The Firefly is completely fine, its mostly M36 and su85 to a lesser degree that are too good
A FF is actually vulnerable to getting rushed by a medium due to its reload time. Originally m36 was also vulnerable to mediums because since it died in 3 shots