Base turrets are becoming more and more obsolete, besides the AA turret. Just like PS1.

Engineer with AV Mana turret is FAR more effective than Phalanx AV turrets any day. They are mobile, can be set up almost anywhere, hit harder, easier to aim, and harder for armor to track.

Regular AV is even better than static defenses because their ability to scoot and shoot makes them more flexible and survivable than static AV turrets.

You'll never see an engineer worth his salt frantically repairing an AV Turret as the armor push comes IF he's got an AV Mana turret. I mean they're fun for infiltrators, but otherwise, they're becoming increasingly pointless.