At the risk of taking this post seriously....
Originally Posted by
hillcrawler
As you know, you are applying maybe 4 different types of force with clipless pedals.
No, you aren't. That's a myth.
Data from pedal-based power meters makes it very clear that you apply very little useable force on the upstroke when clipped in. You aren't applying power throughout the entire pedal stroke; what you're doing is pushing down, and then getting your leg out of the way. I.e. a bicycle operates like a two-stroke engine.
Clipless does not:
• Significantly increase power output
• Fix crappy pedaling technique
• Make it physically easier to climb
The benefits of clipless are:
• Improved control
• Staying attached to the pedals when applying lots of power (e.g. sprinting)
• Encourage riders to use stiff-soled bike shoes
• Improved ride feel
Clipless doesn't cause any real harm, and offers useful advantages for many riders. But it's still not the case that you are applying force in "four directions."