Do flag facilities and missile counts define a cruiser?

Are flag facilities and missile numbers the only differences between modern destroyers and cruisers?

Role matters more in this assessment: a large general-purpose escort resembles a cruiser, although naming habits favor 'destroyer'.

The answer puts more emphasis on role than on a fixed number of missiles or flag facilities. Type 83's projected description as a large general-purpose surface escort resembles the historical work of a cruiser. The proposed American large surface combatant is interpreted in the same way. Both are still expected to receive the destroyer label, despite moving beyond the recent emphasis on air-defense escort work.