Sailboat design question
I don't know squat about the history of sailboat design, so would somebody please explain the change in shapes that have predominated over time? It seems like in the 60's boats were fairly narrow and with the maximum beam around midships, in the 70's they seemed to get wider but with really pinched transoms and the maximum beam pulled back, then the 80's on forward they stayed wide all the way to the stern. All along the way, freeboard seems to have marched steadily higher. Am I off base? Did any of these design trends actually make the boats better at sailing?