@barnee
Hi barnee,
Once again - thanks for your commitment to the Axis & Allies Global 1940 House Rules Expansion.
Concerning Soviet Tank units vs. Infantry & Mechanized Infantry units:
The Red Army Conscription Infantry usually marks the High Tide of Soviet Infantry unit production.
From Late 1942 the Soviet War Effort is focused mainly on Tank production and specialized units, such as Paratroopers, Mines, Elite Infantry, Guards - and Partisans.
Since the Axis can only win the War if the Soviet Union is constantly put under extreme pressure, the Soviets are fighting a defensive battle.
For this battle, the Soviets need a massive amount of Infantry & Tank units.
Mechanized Infantry are redundant for this kind of battle.
The Soviets must use the Strategic Rail Movement Capacity with skill - to move Infantry and other “Slow Moving” units to the frontline.
Paratrooper units are much more flexible and have a stronger Combat Capacity than Mechanized Infantry - so even though they are limited in production numbers, they would always be chosen for production rather than Mechanized Infantry.
This is the case for most Nations.