Not referring to centerboarders or swinging keels that are a particular case it is clear to me that the design of keels and the way they carry the ballast have suffered a technical big evolution on the last 40 years of the XX century, evolution made possible by new materials, new building techniques and computerized hydrodynamic analysis of hulls, keels and ruder and their behavior.
If it is true that a full keel has some advantages over a well designed fin keel it also true that the some of advantages that a fin keel brings makes its use more appropriated in almost all situations and the way the hull, keel and ruder design have evolved on the last 50 years are a proof of that.
Even in what concerns bluewater boats that is very evident. We can pick Halberg-Rassy, Najad, Malo or any other blue water cruising boat that is not made over a 30 or 40 year's old designs, but whose designs have been modified through the years to bring to the same initial program that lead to their design 50 years ago (blue water cruising), all the advantages and benefits that modern design and new materials and technologies permit.
Since Andrews have posted already a drawing of a Malo design from the 90's we can have a look at the Malo hull, Keel and ruder evolution through the last decades (the results with Halberg-Rassy or Najad would be similar):
From the 70's:
From the 80's:
From the 90's:
Already from this century: