https://youtu.be/zEB-cDQmr8c is 5 minutes ago recent enough? rifles had standard formation (as in, select blob, move order).
and yes, infantry does not cost any fuel. again, you said if a unit is straight up better than your opponents unit and arrives at the same time, it is OP. that description fits at least rifles and infantry sections perfectly, since they obviously outperform Grenadiers by a significant margin.
in your example, if you simply replace the sherman with a jackson, suddenly the fight becomes way more "equal" as well.
fact of the matter is, you don't want to hear an opinion that doesn't fit yours. especially when it's backed up by facts.
1- Your video doesn't show a blob.
2- You cannot replace a sherman with a Jackson, you need to wait 135 fuel for that. Can't you understand that?
And Katitof is right, USF infantry cost fuel to be improved...