I was going to say upgrading the Harbah with an Atamca-type electronics stack would be a good idea, but that might not be the intended role and function of the Harbah.
The older (and lower-cost) guidance element is a key benefit in that the PN needs the flexibility to deploy these for land-strikes against fixed targets. Raising the cost of these missiles would constrain numbers -- we need as many of these as possible for the intended role.
I wonder if the 'anti-ship' aspect of the Harbah was aimed more at preventing 1971-like issues -- i.e., to take out incoming FACs (which shouldn't have the same level of ECM or self-defensive aids as a frigate) -- than taking out Indian FFGs/DDGs.
So far, the ships deploying Harbah are FAC(M), but IIRC, the Type 054A/P and PN MILGEM seem geared towards SMASH? (
@Akh1112 can you confirm?). I suspect the supersonic-cruising ASCM (i.e., Project SMASH) would have the more sophisticated seeker and ECCM stack since its role is to take out ships with better air defence, ECM, and other aids.