I tend to agree with that. Until last night one commuter had platforms, one has MTB clipless. (The platform pedaled bike was stolen last night)

Anyways, the power output doesn't concern me, it's the comfort and stability. I have a bad knee with range of motion issues. Pedal strokes are fine, but if I'm not clipped in i find my right foot always wanders forward without thinking about it, subconsciously making me bend my knee less at the top of the stroke.

I can still ride just fine on the platforms, and love them for just hopping on and off easily. But I feel much more secure on the clipless pedals.

That said, once I get into really nasty terrain I prefer platforms. Because my off road bike handling sucks and I need to put a foot down a lot. Even though I can clip and unclip without thinking or looking when on the street, I prefer not having that millisecond delay of platforms.