Obviously you’re not a true foot connoisseur like myself. Most experts agree that the bottom of the feet are the best, as seen by the angles most foot fetish art is drawn, the arch particularly allows for quite angular movements downwards which you wouldn’t get with the sandal restricting the foot. There’s also the semi unique quality that is brought to light with sandals, that being the tan line, which you just don’t get with other shoes, the lighter skin line compliments the darker skin that surrounds it. Nothing personal kid, but I get deeply offended when one disrespects the art of feet so unabashedly.