What separates low-, medium-, and high-end air-defence ships

Is an air-defence destroyer's level determined by how many targets it can engage at once?

Simultaneous engagements matter alongside magazine depth, the area and formation a ship can protect, and its ability to deal with satellites or other space-based problems.

A low-end air-defence ship principally protects itself and a few nearby vessels. Medium-level protection extends farther, while a high-end ship covers a large area. Magazine depth matters alongside the number of targets a system can engage simultaneously. The panel also includes the ability to deal with satellites and other space-based problems among the possible distinctions at the upper end.