For OPVs specifically it would have made more sense to add more of the Damen ships from the Netherlands. But as this is coming from the U.S., I suspect subsidies or aid is in motion.
The PN is building a three-tier system:
- PMSA MPVs
- PN OPVs (i.e. Damen OPV and Swiftships OPV)
- ASW-capable frigate and corvette fleet (i.e. F-22P, MILGEM Ada, new Chinese frigate)
All that VLS, LACM, etc stuff is in area (3). The areas (1) and (2), while growing in number, cost a fraction of what it'll take to build (3), but they're necessary to take on maritime policing. You wouldn't want to send in a MILGEM Ada with its composite super structure into a scenario where it can get hit by random RPGs and ATGMs... That's where these MPVs and OPVs come in, especially the OPVs as they can be heavily armed too.