I don't think it's wrong at all. The Jackson is the best tank destroyer in the game, no argument from me on that point. I just don't see a problem with it being the best TD in the game, I mean one unit has to be the best TD right? I think the real problem isn't that it's the best TD in the game so much as it's the best TD and belongs to USF.
The Jackson's design neither presents any positional counterplay nor allows the opponent to just buy a bigger gun (commanders notwithstanding). You can only counterplay it with non-vehicular AT. Otherwise it can only be outmacroed.
The Jackson's original design didn't have this problem: it cost 125 FU and had 480 HP, meaning it had to play carefully at range like the other two TDs. Spamming Jacksons wasn't really an option: because of their fragility you needed something else to defend them.
This was changed as a balance necessity: USF's shitty tech structure was full of holes thanks to Relic's ~2014 obsession with shipping factions with huge gaps in their basic tool roster. That change made USF functional in larger gamemodes, but it also made the Jackson what it is today.
While USF's tech structure has improved, I don't think you could just revert the Jackson to its better designed but less balanced earlier incarnation. What USF needs is a full review of the rest of its AT roster (currently
entirely geared against LVs for some inconceiveable reason) and then changes to be made to its other units so the Jackson
isn't the only mediums-up nondoc AT tool.
Then, and only then, could they look at turning the Jackson back into the nimble sniper it was designed as.