The America’s Cup showcased foiling under sail; something no one can ever unsee. Foiling is the new standard. Swing keels are also a standard in the search to reduce wetted surface.
It is hard to imagine that “Charisma” was once the standard for speed under sail. Construction with aluminum lent itself to very strong boats that could be easily altered. “Charisma” was perhaps the penultimate IOR boat.
For ease of altering a boat nothing can beat aluminum. Carbon fiber is however in a class by itself for strength to weight ratio; making today’s yachts lighter and stronger than ever.