Not quite... using a 5.56 chambered sharpshooter rifle would decrease much possibility of collateral damage against civilians in urban ops. If you miss a target with a 7.62 and hit a wall, the projectile would penetrate relatively far (I've heard that it will go through 3 brick walls however Idk about the validity of this) whereas 5.56, which is predominantly used in built up environments, does not penetrate as far.
So with the 5.56 you won't inadvertently injure or kill civilians.
Sounds fairly useful to me.
5.56mm is pretty suited to the kind of ranges you'd see in most urban environments, and as well as this you'd be able to share ammunition and mags with other soldiers- this could be vital if any supply lines were cut to your force.