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		 First, they're shoes, not robotic/mech implements, meaning that you are only getting some support, not a complete replacement of the stability required for the movements.  
 
Second, a major purpose (for me anyway) is the shoes provide protection against slipping and awkward positioning. Shoes provide a constant "flat surface" (meaning the sole).  
 
Sure there are benefits to going barefoot, but either option has its pros and cons. 
		
		
		
		
		
			
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				Knowing that death is certain and that the time of death is uncertain, what's the most important thing? 
—Bhikkhuni Pema Chödrön  
 
Humankind cannot bear very much reality.   
—From "Burnt Norton," Four Quartets (1936), T. S. Eliot
			 
		
		
		
		
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