Norway is in the forefront for Ship Design, Marine Equipment development, building and outfitting of specialized vessels for the Offshore industry, (incl. deepwater mining) Fishing vessels, Live Fish Carriers and of late, Expedition Yachts for Polar operations.
Even so, the hulls are mostly built in places with lower labour cost, since it is uneconomical to do so in Norway/NW Europe. (It is not allowed to pay foreign workers less if they are doing the job in Norway/ NWE)
Norwegian designs and marine equipment are also widely sold internationally, incl. to USA.
Building large ships, like VLCCs, VLOCs, VLNGs, Mega Container carriers etc. is not economical in Norway, or anywhere else in North West Europe/EU. The only large ships built in EU countries are the Mega Cruise ships built in Italy, France, Germany and Finland.
Why would Norway construct a yard that will only be used to build a one-off vessel, when it can be done much cheaper other places?
Delivery of equipment incl. commissioning, installation, maintenance and servicing during a 20 year life cycle, will give jobs for many Norwegians. The extra cost of construction in Norway (assuming there were a yard able to do so) is estimated at 25-30%, which may or may not be enough to make the field uneconomical. If it becomes economical to develop the field by building the FPSO somewhere else, so be it.
Like all other major ship owning nations (incl. USA) most standard bulk carriers, tankers and PCTCs etc. owned by Norwegian companies are now built in China, with more complex ships, like VLNGs, still mostly built in S.Korea.
The same applies to Offshore Rigs, with Singapore being a competitor, especially for Jackup rigs of own designs. Conversion or building of FPSO/FSRU and FLNG units are also mostly done in those three countries as well.
Why is that? Because market forces are governing where things are built, not Governments and/or Unions.
US Shipowners hold a large fleet of ships in international trade (5th largest by GT) and US Drilling Contractors are among the largest owners of Offshore Drilling rig/Drillships, but nearly none of them are built in USA, or NW Europe theses days. They still give work to a sizable number of Americans in Management, Operation and related services.
In the Drilling industry there are also a large number of Americans working on the rigs, but admittedly, very few on the US owned merchant ships and cruise ships.
So your conclusion is???