Thanks but you need to remember that the DDL or Light Destroyer was envisaged as a lower end complement to the existing destroyer fleet of Battle and Daring class (which were planned to be upgraded with Ikara and possibly Tartar), as well as the new DDGs and the ASW focussed frigates / DEs. They were basically fast sloops i.e. because of their general purpose but lower rate sensor and armament fit, that evolved into destroyer replacements following the addition of helicopters, then Tartar to protect the expensive addition.
I suppose a good modern analogy of the original concept would be the USNs LCS, Germanys K130s, or Turkeys Milgems, a complement to the existing and planned high end major combatants. Intended for cold war counter insurgency in littoral environments, but designed to be survivable against high end threats should things heat up. Something the RAN still desires today and may finally get depending which OPV is selected for them and whether the design retains its foundations and interfaces for a more capable sensor suite and combat system.
