I mean to say that Namica without a 30mm cannon as you have asked makes it a weapon as good as it is meant to be. no matter an additional gun fitted would be a great add on but at a cost.
Missiles are generally not exposed to vulnerable environment, preparedness and logistic/reinforcement depends upon tactics and deployment that's how a war is won even the best weapon system without it may fail to deliver.
BMP-2 in its original role is meant to be a battle field weapon as an infantry fighting vehicle but a Namica have nothing to do with infantry fights it plays the role of a tank killer, you won't risk a tank killer in a skirmish fight.