I don’t think the intention with the Mowj is to go toe to toe with the USN (a crazy idea considering the vast power the USN fields in the region) hence the rather light air defence systems. Its role is to give a bit more teeth to coastal defence by the looks of it. A fairly sensible move considering the more fluid nature of events in the region. It has a fairly big gun, decent anti ship missiles and a heli deck allowing it to police Irans coastal waters.