Sure, but at what point do you decide that is it worth literally stripping the whole thing down to the shell and reinstalling new systems from the ground up? It was a short sighted move on behalf of the PN to go for the 053H3 platform, id argue with the induction of new ships they become a liability. While yes, the hull itself is probably capable of far nicer sensors and weapons, could the potential cost be worth it? Im certain it would be more economical to procure a new ship along the lines of J-Class or a follow up 054A/P order. Though, the latter would be costly, it would be sensible for the PN to reduce the amount of platforms and have one or two mainstay's (054 and J-Class) in the weight class while having Azmat and Azmat based platforms below. Maybe if PN decides they want a corvette they could look at Sigma or whatever. I guess it all comes down to the quality and the overall costs of the hull, how much life they have left, is it worth it vs a new platform? etc etc