It was a little “more complicated” than that. Sherman’s had been rolling off the assembly lines for months but the US 1st Armored Div didn’t have them. They were sent to Montgomery to re-equip his armored brigades prior to 2nd Alemein. The Sherman in ‘43 was better than anything the Germans had in North Africa (except a relative handful of Tigers shifted down from Sicily).
The real weakness was the lack of larger caliber anti-tank weapons in general. 37 mm was kinda standard then.
Understandable, but the tank crews themselves were concerned with their tanks more than anti-tank guns. They knew they were facing the Germans with inferior tanks.