We discuss about maples branches styling, but with pines, you can see in Nature, in the wild that the branches go up (same as deciduous), even with pines growing on mountains (with lot of snow weight on the branches) ->
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So why do we always represent pine Bonsai with hanging/falling branches ?
IMO it is because the hanging branches enable to fill empty spaces and make the tree look old...
But why not a pine Bonsai with branches going upside ? It is sometimes done but it is very rare (if i remember good, MichaelS does it too on this forum).
An example in the Sakufu-ten #2 ->
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