Many vehicles including both tech tree and premiums suffer from this. The commander fire control system leads to false aiming, inconsistent ATGMs, and weird ATGM trajectories. Mostly the ATGMs never travel along the crosshair, they always have some false offset.
List around:
9040 BILL ATGM
T80UE1
2S25
2S25M
etc, almost all the tanks can fire ATGM while using commander fire control
Question for you, do you usually use barrel sight perspective or gunner sight perspective? If you use barrel sight perspective then the offset orlf the commander sight will cause things to be a bit off compared to your gun sights because of the different location. You have to aim slightly differently to conpensate.
Also the ATGM will never aim below main barrel depression, even when your commander sight sees the target.
And you can’t lock any F&F missiles below main barrel depression either.
Makes commander sights almost useless in vehicles like the QN506 and M3A3.