Clipless pedals and shoes are a gimmick, there is zero scientific testing that shows they increase anyone's power. If you have developed and worked for good form with flat pedals, then all switching to clipless will do is make you lazy and make the muscles and coordination you developed to keep your feet on flat pedals deteriorate,

The science shows that the muscles used to lift your legs have only a small fraction of the efficiency that the muscles have for pushing down. This means that initially when you start riding you get a little thrill with a hair more acceleration on the flat or ease up a hill, but after a few minutes you will have nothing but muscles able to nothing more than they could do with flat pedals.

People say that clipless pedals secure the foot on the pedal, but so does coordination and skill, and in a lot of falls where you have to get your foot down quickly for a save you are not going to if your foot is fastened to the pedal and you are going to end up on the ground.

Most of the population follows fashion trends and marketing and tradition, if you want to be exceptional then switch to independent and critical thinking and actual research and science.