I am looking foward to trying out the A4 upgrade, but a 360 degree firing ARC is a powerful thing, particullarly with hypermoblie ships running around. the turret makes you more flexible and gives you options. I like some of the scum options for blaster turret and the bomb capability. A4, well, we will see.
This, with the extra point that Kavil's special ability only kicks in out of arc.