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just walking
in Science
Debra AI Prediction
Arguments
  Considerate: 94%  
  Substantial: 81%  
  Spelling & Grammar: 85%  
  Sentiment: Positive  
  Avg. Grade Level: 13.4  
  Sources: 0  
  Entity Sentiment Detection: Arm swing    lower limb   natural motion   rotational motion  
  Relevant (Beta): 7%  
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  Considerate: 80%  
  Substantial: 56%  
  Spelling & Grammar: 96%  
  Sentiment: Neutral  
  Avg. Grade Level: 9.98  
  Sources: 0  
  Entity Sentiment Detection: upright position    limb walking   person   arms  
  Relevant (Beta): 90%  
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  Considerate: 88%  
  Substantial: 15%  
  Spelling & Grammar: 91%  
  Sentiment: Neutral  
  Avg. Grade Level: 2.94  
  Sources: 0  
  Entity Sentiment Detection: people    Note   knuckles   website  
  Relevant (Beta): 89%  
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  Considerate: 93%  
  Substantial: 93%  
  Spelling & Grammar: 100%  
  Sentiment: Neutral  
  Avg. Grade Level: 12.36  
  Sources: 0  
  Entity Sentiment Detection: dynamic balance    natural balancing mechanism   strange motions   hands  
  Relevant (Beta): 17%  
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  Considerate: 80%  
  Substantial: 66%  
  Spelling & Grammar: 89%  
  Sentiment: Neutral  
  Avg. Grade Level: 6.74  
  Sources: 0  
  Entity Sentiment Detection: original use    leg movement   tight rope   arms  
  Relevant (Beta): 42%  
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I do not think there is a dichotomy between these two. Our 4 legs evolved into 2 legs and 2 arms, but the physics has not changed: we started walking differently, but we still need all 4 limbs to do it effectively.
You are right that it is possible to walk fast without swinging our arms, and even, perhaps, to run doing so - but the balance will be off, no matter how much we practice. It is like cycling and not holding the handlebar: it is possible to learn to cycle this way to the extent that you will be a better cyclist than most regular cyclists - but you will still have much less control over your movement than you would with your hands on the handlebar.
Or think about driving a sports car fast and holding the steering wheel with one hand: you can drive very well this way, but at the same time you can drive much better with both hands on the wheel. You do not "need" both hands, but you gain a strong advantage if you choose to use both of them.
  Considerate: 92%  
  Substantial: 98%  
  Spelling & Grammar: 96%  
  Sentiment: Positive  
  Avg. Grade Level: 11.18  
  Sources: 0  
  Relevant (Beta): 92%  
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  Considerate: 86%  
  Substantial: 96%  
  Spelling & Grammar: 95%  
  Sentiment: Neutral  
  Avg. Grade Level: 7.84  
  Sources: 0  
  Entity Sentiment Detection: little baby    movement of our arms   arms   arm movement  
  Relevant (Beta): 89%  
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