Shimano put the best product on the market 22 years ago. The DX pedal. It had a different shape than anything else that was available at the time. The competition came from KKT, SR and also Skyway had a similar aluminium pedal on the market.
Shimano's DX pedal had a concave platform and used 12 unique stud pins for an amazing grip. The first of its kind. The revolutionary parallelogram profile made it easy to get your feet back on the pedals quick. The body was made from a solid one piece alloy. Shimano changed the BMX pedal industry with the DX model. Many copies would follow.
Side note: The DX pedal has more purposes than providing pedal grip. It is an excellent beer bottle opener and we have seen people use it as a knuckle-ring. Without axle for better movement, with axle for extra weight. Seriously.