Being able to fire from complete cover w/ -3 penalty, combine with a periscope to minimize your exposure...
Reason why a smartgun system let you fire around corners without exposing yourself for only -3 dice instead of -6 dice as you normally get with Blind Fire is because the smartgun come with a
camera.
Instead of
camera you can use a top mounted
periscope to fire around corners without exposing yourself.
A top mounted periscope only give you a negative dice pool modifier of 2 dice (or just 1 dice if wireless).
You can use a weapon with a top mounted periscope together with a built in or under barrel mounted laser sight.
Using a smartgun system (or rather a camera) is not the only way to fire around corners...