I was thinking: There really aren't any truely canonical starfleet designs called Destroyer, and according to Spacedock, which I assume is correct, starfleet doesn't have any becuase a destroyer is primarily a military vessel.
Well, that may be true, but destroyers in waterborne navies are defensive ships, not offensive. The term destroyer comes from "submarine destroyer", from the WW1 era.
So, that, and the fact that you could slap on some scientific gear onto a spacedock design, and why not have destroyers in Starfleet?
For that matter, what do you all think about having destroyer type vessels serving in federation militias (like the VDF or ADF)?