Air condition and Convertibles

I rarely have seen so many closed convertibles (top up) as currently with temperatures around 30 degrees of Celsius and higher. Nobody would have done this in the 70ies or 80ies - convertibles are built for being driven open when the weather conditions allow for it. With the habit of having powerful air conditions on board though, people consider the temperature in the car can be lower with the top up and air condition. But why do you need a convertible for this. And what about the disadvantages of modern convertibles with the top up? The Nissan 370Z is one of the car with the worst visibility when the top is up. And also many of the coupé-convertibles suffer from bad visibility. So, my advise, forget about the air condition, open the top, enjoy the real weather, be more safe and save fuel.