He wouldn't. He was a big proponent of GI's making any necesary mods. He himself tried time and again to get the Army make numerous changes on the Sherman and later tanks to no avail.
He was also a driving force behind the aquisition of the undergunned and underarmored Sherman because he preferred mobility. It meant his tankers suffered roughly 5 to 1 losses. Thank god we had the skies.
Heard Patton was the guy who slowed down deployment of the the Pershing Tank, which was available in 1943 and was more than a match for any German tank. He evidently was madly in love with the Sherman's speed.
Any truth detectors on this?