What are the disadvantages of securing your foot to the pedal? I understand that there are many benefits when it comes to different methods of securing your foot to the pedal, and how they allow for more power through an entire revolution of the pedal. 

However I am struggling to find a source talking about the disadvantages of these systems. If you know of any different disadvantages for different types, please explain.
The only disadvantages I could think of are:
- The higher price for clip-less pedals and the need to have cycling specific shoes (which are usually not comfortable in walking)
- Not being able to comfortably ride your bike with normal shoes again. However, you can overcome this by going for dual sided pedals.

On the bright side, you get to use different muscles while pedaling which make cycling more comfortable. You eliminate the chances of your foot slipping off the pedal and getting your leg hit.

When I first started using clip-less pedals, I only fell once. It was because I forgot to un-clip at the end of my ride. Now, if I was going to fall off my bike for any reason, I can smoothly and quickly un-clip my self to prevent the fall.