Same for the panther, tiger, king tiger, churchill etc... even the OKW Pz4 could be included into this list.
People are simply focusing too much on the Jackson in a vacuum and don't want to look a the faction as a whole. The Jackson is the only mobile dedicated AT unit USF have and this is the root issue of what the Jackson is today. Adding that the second AT unit USF have is locked behind a optional tech make the USF faction overly depending on Jackson to be its bread and butter for AT.
Note that Ranger's change with super-zook gave new opportunities to USF players (at least on 1vs1) to be less dependent on Jackson to counter medium tanks and Panthers.
All those things you listed can be outraged by stock units and thus kitted. The enemy has to withdraw to avoid damage or make a move to address the thing damaging them. The Jackson has the mobility and range to not be challenged in this manner.
The exclusivity of the Jackson is why I want changes to be careful and calculated taking that into account. I don't know if you have been reading up to this point but I'm arguing against a simple price increase because, as the USF's only mobile AT it puts too much weight on killing or keeping it.
I don't want the unit gutted, but saying it doesn't need toned down is Ludacris given all the benifited stacked in its corner while the corner for proper design and counter play gather cobwebs.