That was not just Gen. Patton's 'belief', that was US Army Doctrine. Tanks supported infantry & (light tanks) scouted. Tank Destroyers dealt with enemy tanks. A 'belief' can be changed, but Doctrine is what you train to & is much harder switch since it influences the design of the weapons.
It should be noted that only the TD's had guns heavy enough to deal with the frontal armor on some German Tanks, and even then it was iffy.
Rommell used to use his 88MM anti-aircraft guns as "PAK Screens" in the Desert. Draw the enemies' tanks onto the long-range high-velocity guns, then whip around the flanks with your own tanks.
The 90mm was mounted on the M36, it could outshoot an 88mm.