thats not the complaint. the complaint is, for 10 fuel it has 20% better armor, about 50% better penetration and considerably less scatter (though it does have 20% less AOE). thats a hell of a bargain for 10 fuel.
In a vacuum, It absolutely is a bargain, but as I am sure you are aware, this game doesn't work like that. p4 isn't tied to a doctrine first of all. More relevant I believe is the point that you so cleverly dismissed.
not sure what this has to do with anything. all AT weapons are available before tanks.
What this has to do with anything is the fact that the US's AT capabilities are gimped when compared to their nazi counterparts. The E8 is the ONLY US tank that can take a hit (and I cannot stress enough the fact that it is doctrinal) This, combined with the fact that german AT is superior to the US's AT capabilities is why I don't think this issue is as cut and dry as a simple stats comparison.
soviets are hardly limited, particularly because they are able to rely on call ins so heavily. t1 and t2 builds are viable thanks to call in tanks. if you go t1, you can rely on guards for AT. if you go t2, you can rely on shocks for AI. no matter what you build, you can always rely on is2, isu152 and t34/85. I really don't see a lack of versatility. compare that to the wehrmacht options.
The wehrmacht options I see are the ability to build a well rounded army with a couple of buildings and not relying on call-ins (try doing that with soviets). You say they are able to rely on call-ins so heavily, I would say that they HAVE to rely on call-ins so heavily to compete.
even if they tied tanks to teching, they could allow both t3 or t4 to unlock call in tanks. then youre still able to build any combination you want, or still rely completely on call ins. the only difference would be you have to spend fuel on teching costs just like everyone else.
Sounds like using a sledgehammer to drive a nail. Why open up a whole new can of those pesky balance worms when your percieved problem could be solved by: A. supporting your units or B. Minor tweaking a single unit's cost?