When I look at the Type-56 and compare them to the K-130, I don't see them being underarmed.
But they do have a different focus on ASW and patrol, rather than anti-air and anti-surface.
Because in anti-air, it is airborne assets from the nearby mainland China or a carrier which will be the decisive factor in shooting down opposing planes/missiles. And in anti-surface warfare, it is again airborne assets which are best placed to detect enemy ships and then launch missiles against those ships.
Plus there should also be nearby Type-54 frigates and Type-52D destroyers for area air-defence, as a backup.
But they do have a different focus on ASW and patrol, rather than anti-air and anti-surface.
Because in anti-air, it is airborne assets from the nearby mainland China or a carrier which will be the decisive factor in shooting down opposing planes/missiles. And in anti-surface warfare, it is again airborne assets which are best placed to detect enemy ships and then launch missiles against those ships.
Plus there should also be nearby Type-54 frigates and Type-52D destroyers for area air-defence, as a backup.