The main purpose of the fin keeled cruising boat, sometimes called a "racer/cruiser" is to emulate the high performance of the racing boats.......
You can only be jocking. Halberg Hassy, Oyster, Malo, Najad, Hinckley, Morris, all well know cruiser-racers trying to emulate racing boats!!!!
My God, that is really too much Wolf
As I have said, most of them were once full keelers, or medium keelers. They are now fin kellers to sail better not to race or to emulate racers. They are all bluewater cruisers and that's what they were built to do: Bluewater cruising, not to race or even cruiser-racing.
I think everybody can agree with that, I mean cruiser-racers?!!!!
... The "classic bluewater boat" is a heavy displacement full keel....
Finally something I can agree with you. Yes in what regards Classic boats you are right.
However modern bluewater boats are fin keelers and that is a fact. Why the hell there is not a market for modern full keel bluewater boats if they are better than fin keel boats for bluewater work? Do you really believe that all the boat designers all the sailors that buy those bluewater boats are wrong and you are right? All of them?
Nothing wrong in liking to sail or own classic or traditional boats (I love both) but from there to pretending that the advantages of a better designed sailboat ended 75 years ago goes a big distance