How sloops map onto modern OPVs and corvettes

Why not use the name sloop for modern offshore patrol vessels?

A peacetime sloop is broadly comparable to an OPV, but higher-end sloops overlap with corvettes, destroyer escorts, and frigates, so the labels remain role-dependent.

Sloop, corvette, and offshore patrol vessel overlap because their roles and capabilities do not fit a fixed tonnage ladder. A peacetime sloop's work corresponds most closely to an OPV. Some higher-end sloops also overlap with corvettes, destroyer escorts, and frigates. The comparison leaves room for different national practices and treats the ship's assigned role as more useful than settling on one universal label.