Because we have 2 legs and rhythm works best when you can dance to it. ie in beats multiple of 2.
That’s why 4/4 is most common. When you have 3/4 you’ll dance in circles for instance waltz, and certain beats like 6/8 can be danced either as multiple of 2 or 3.
A 5 beat dance will be more difficult to dance to, but definitely possible. Many Indian music are in 5/4 and they dance just fine.
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