Yeah, because of the recoil, a vehicle like that can only be used in ambushes or in situations where you stop, fire, then move, then you need to stop to fire again. It loses in terms of mobility. Imagine firing something like this in a marsh. The tank would get bogged down. Also I doubt that suspension lasts long with a gun like that unless they reduce the propellant pressure. That might be the reason why the Russian Airbone Troops cancelled the Sprut SD (only 24 vehicles produced before it was canned). Yet they have ordered large numbers of BMD-4s which use a 100mm rifled low-pressure gun.