If all the urban maps didn't get constantly removed this wouldn't be true at all. Old 2v2 maps like Dusseldorf and Trois Ponts were great for E8 cause the Jackson was mostly useless on those maps
This is the age old problem. The Jackson has to be that good because Relic decided to give USF by far the worst final tier. And the fewest stock AT vehicle options
Even in an urban environment the Jackson is no slouch. It's still the best of the 60 range TDs because it can run and gun.
I disagree that the Jackson has to be so all encompassing. USF has many tools, but they have all been ignored in favor of the Jackson. Elite zooks imo should be on officers, the Stuart was initially supposed to be an AT support tank. HEAT on the pak howi. Sherman AP shells could easily be buffed as well in exchange for even weaker AI on them (radius is only slightly smaller than other all in one tanks for example)
There are options, BUT the Jackson is there so we've just made it the only viable option and thusly massively efficient to the point of making doctrinal options redundant
Frankly they should swap the m10 and the Jackson.
Bump the m10 up to 60 range and tune the gun to fight heavies and not mediums. But lower the turret rotation (crank powered turret).
Bring the Jackson back to a super mobile high reward but squishy and require micro again.
Then you have the m10 with weaknesses that allows room for more mobile (as in turret) Sherman's to have a niche. The Jackson doctrinally has a place as a hard hitting glass cannon again that would synergies well with the 105 Sherman and its beefy AI. Everything has a place and a playstyle and usf isn't left in the cold.
Additionally 57mm vet needs looked at to bring it more in line with other AT guns
Perhaps some sort of economy upgrade that reduces munitions costs of stock shit by a bit with full tech wouldn't go a miss to keeping USF competitive and unique as well.
There's things that could have been done, but the path taken has made the Jackson too much to balance other options without breaking something.