It's when the designer tries to accommodate into the design all that volume and speed that seems to be so desirable and sacrifices what they know better.
Bob Perry makes his performance cruisers and still keeps to the 80s concept in almost all his new boats. It's only when a particular customer wants the speed and room that he deviates. ( at least I believe that's right from looking at his new designs ) He seems to stay pretty classic in his approach.
German Frers seems to have made a good compromise in his Hylas designs.