Then what? You go inside again and the car idles, wearing it excessively and creating a bunch of entirely unnecessary emissions? Or do you go to work in flip flops?
Edit: I can sort of see the point of remote start if it's a gazillion degrees out and the seats are so hot from the sun they burn. The AC needs a few minutes to sort that out and it works just as well standing still. But for heating the car it's so terribly inefficient.