One benefit of clipless (I ride them and platform, and I think each has advantages/disadvantages), is for high-cadence spinning, and downshifting where you don't want your foot to separate from the pedal when the resistance suddenly drops. If you're concentrating, platforms are fine, you can train your legs to keep your feet on the pedals, but sometimes you get tired, lose concentration, and "crap!". Toeclips prevent this. However, everybody I know who has ridden clips for a long time, and given clipless a reasonable testing, has switched. This can include learning how to click-out on a stationary bike before hitting the road, using hybrid platform/clipless, and buying light-spring-tension release models for your first transitions.

If you have excessive pronation/supination, you can get shims, or get "more forgiving" cleat/binding systems. Shims are great in principle, but they may transfer injurious stress to your knee(s).

There are lots of great models, and the fact that there are several different basic designs (along with copycats for some like Look and SPD, not Speedplay or Crank Bros yet, still under patent), tells you there is no "perfect" pedal for "everybody".