So, if the turret problem emerged after wave 4 hit (which happened well after the Falcon arrived), can it be said that the Falcon is actually the problem? Or is it a result of the TIE Phantom Menace?
Two things led to Fat Turrets: C-3PO and Z-95s. 3PO (and now R2, as Paul has shown) was a tipping point in the ability to stack defensively-minded upgrades onto a turreted ship, allowing it to maximize the turret's capability to not worry about pointing at targets. It also created an inflection point where a game will tip towards un-damageable Falcons. Z-95s allowed more points to be dumped into the Falcons to gain that, while actually increasing the efficiency of the support ships around it.
I'm astonished that we have to keep having this "Han was always around and lost so nothing changed!" discussion. Yes, turrets changed in Wave 3.5/4. No, it had nothing to do with Phantoms. Yes, Fat Falcons are a solid answer to Phantoms. No, they are not useless in a non-Phantom environment.