Actually the Panzer IV and Sherman AP have roughly the same effectiveness vs Infantry. Sherman HE is an optional strong-man choice to force-retreat infantry rather than just push them around. The Panzer IV is only better in its stock machine guns, but the Sherman has a superior MG Upgrade.
USF sherman pintle costs more munis and have less dps.
Just saying.
And if you people want P4 to be on pair with ez8 and 34/85, then do so, but lock it behind a doctrine as well. If you have problems with ez8 and 34/85, then don't spam P4s like an idiot and supplement them with StuGs.