It does make perfect sense, but I have a few reasons why I'm still using a ton of CIWS:
Since each CIWS has its own built in Fire controls, each one can fire on different salvos, if needed. Plus, since each ship has at least one CIWS, even if my escorts are preoccupied, all of my ships will at least have some defense.
As for my escorts, each one has two fire controls with three single turrets apiece. I suppose I could've sacrificed their CIWS in place of another 4 fire controls, allowing each turret its own fire control, but I'm fine with my current decision.
I'm still assembling the fleet, so we'll see how it works when I meet some neighbors. If I die, I die. I mean, as we say over on the Dwarf Fortress forums, Losing is FUN!