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Why could the Pz. III not match the Soviet T-34 on the Eastern Front?

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Kuwait: U.S. 1st Armored Division M1A1 Abrams tanks — tank M1A1 Abrams main battle tanks of the U.S. 1st Armored Division moving across the desert in northern Kuwait during the Persian Gulf War, February 1991.

The German Pz. III was unable to match the Soviet T-34 on the Eastern Front because it was completely outclassed by the Soviet tank's superior design features.1

While the Pz. III was initially effective against most Soviet tanks during the 1941 invasion, it could not compete with the T-34, which possessed the following advantages:

Firepower: The T-34 was armed with a lethal 76.2-mm gun, which significantly outmatched the Pz. III's armament.1
Protection: The T-34 featured sloped armour, which provided superior defensive capabilities compared to the Pz. III.1
Mobility: The T-34 demonstrated excellent speed and mobility on the battlefield.1

Even after German engineers attempted to upgrade the Pz. III with a high-velocity 50-mm gun and increased armour thickness (50–70 mm), the tank remained unable to cope with the T-34. Consequently, the Pz. III was eventually withdrawn from service on the Eastern Front. This technological disparity prompted Germany to initiate a crash program to develop new, more capable tanks, such as the Pz. V (Panther) and Pz. VI (Tiger), to counter the T-34's dominance.1