The allies use a variety of specialised vehicles to do their duty in the field. Mediums against heavy armour, lights against lighter armour, rangers and apcs against infantry. They strictly rely on their unit composition in the field in order to be successful. Removal of a singular element, like an apc or a medium tank can completely cripple the entire allied force from performing their duty.
Soviets, on the other hand, have the freedom of utilizing all-purpose non-specialised units. Mammoths are good against anything, tesla tanks are good against anything. Additionally, when said vehicles die, soviets also posess all-rounded infantry like shock troopers and volkovs, which can continue the fight no matter what the allies are throwing at them.
In other words, vehicle survival is crucial for allies in the field, while soviets can maintain their firepower and utility even on foot, as their vehicles die.