My feet are actually cleaner and smell better than usual. All that fresh air. Fungus and athlete's foot require a moist environment such as socks and shoes. Without clothing, skin dries quite easily. Likewise when I ride my bike long distances I'm apt to remove my shirt so that by the end of the trip I don't even smell sweaty.
I haven't done as much barefoot hiking recently, but in my most active time an average hike was about a dozen miles, which took 3-4 hours. When barefoot one tends to be more conscious of where one walks, and thus you're less apt to trip over rocks/roots. Of course, for times when you don't want to pay attention, shoes are helpful.
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