Why are all Road Cyclists NOT using Speedplay Aero Pedals?

They’re heavier than my current pedals (pedal + cleat). Plus I have Assiomas on one bike so all my shoes already have Look cleats. There’s no way I’m buying 5 sets of Speedplay cleats. Other than that, all the reviews are either “they’re the best pedal system ever” or “they’re the worst pedal system ever.” So people either love them or hate them. I don’t feel like trying that experiment.