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And it would also be completely impractical in its intended role, or for any other conceivable role the Norwegian Navy would be interested in filling.
Hybrid propulsion was actually used initially, but served no real purpose in a craft designed to operate in coastal waters, where cruise range and endurance are meaningless metrics. As a result, the Skjold was refit to an all turbine configuration and the later ships were built the same way from the ground up.
As far as additional weapons go, that would require a larger platform, which would limit its ability to maneuver in the irregular coastal terrain, slow it down, make it harder to conceal as well as limiting its ability to refit and refuel from small civilian and makeshift harbors, something that’s critical for the kind of hit and run tactics these ships are designed for.
If you want a frigate, build a frigate. Don’t take an existing design for a smaller warship, make some rudimentary changes to it and expect it to fill the role of a larger warship. It’s not going to do you anything good. Especially not with something tailored so specifically to one role as the Skjold is.