They all do what they were designed to for a given use. If you use one for something it wasn't really designed for then some feature is going to look like a flaw. There are compromises to be made when designing for various conditions.
for example no boards is a flaw if your are racing upwind against a boat with boards. centerboards are a flaw if you are racing against a boat with highperformance daggersboards. while daggerbds. are a flaw if sailing around soals or reefs. flat rocker is an advantage in smooth water and for speed (if done right), but it's a flaw in the surf. acres of sail area is a flaw in strong wind, but an advantage in light wind. it is a flaw to put a beam on the bows of a boat that tends to sail bow down in a breeze, but the front beam is an advantage for light to moderate wind. it is a flaw to make a boat for strong wind and rough seas, but fail to have a way of adding footstraps.
hope this helps.