I agree that the E8 should be better but i absolutely dont see no reason to include it in an "Urban Assault" commander. There are several units that would need a buff - for example KT, IS-2, Ostwind - and still dont get touched. Make them better in a seperate "balance patch", so over- underperforming units dont need to be part of a revamp / new commander. These changes could be included in the new mod versions and tested properly.
BAck to E8:
I could even live with the E8 in "Urban Assault" if USF wouldnt have other doctrines which offer premium mediums or the Pershing. USF cant have best light vehicles, super strong elite infantry, the best non doc TD AND better mediums in most doctrines. USF's weakness is and should always be the tank department. If you take that away the faction is way too strong.
About Calliope: He should just be brought to the same performance and cost level as the Wehrmacht's Raketenwerfer then the unit would be very valuable in teamgames.
But the armor weakness for usf is always there. If you choose heavy tank you dont have doctrinal medium tank or rocket arty, if you choose better medium tank this will be the strongest tank you can get while opponent has nondoctrinal heavy tanks and rocket arty. You are always limited by the doctrine you choose.
This doctrine would lock you out of heavy tank and off map arty strikes, there is a trade off.
You say easy8 should be better but people behind balance dont think that way. Just look at calliope after rework, still the worst rocket artillery in game by a far margin AND MOST EXPENSIVE. There wont be meaningful easy8 rework so we can at least include it in this commander to get rid off jackson and 75mm sherman spam.
Im sorry but i just want to use different units without being forced into game losing doctrines. This new usf commander proposal is simply boring, if you cant see it i cant help you.