Different navies derive value from the same platform in different ways. For a Royal Navy with only six destroyers, a highly flexible ship would be attractive to commanders outside the carrier task group. Detaching one from a planned pair could leave the group with only a single air-defence destroyer. Specialisation can therefore protect force availability by making the ship's intended task-group role harder to dilute, a concern that also applies to demands on Type 26 frigates.
Notable Point · 3:42:37-3:43:53
Why a small navy may need specialised destroyers
A general-purpose destroyer is attractive on paper, but a small fleet may lose it to other assignments and leave its carrier group without enough dedicated air defence.