I think people should have a random choice of 2 chakra modes, chakra type gives an advantage but does not limit ur use of chakra. Sasuke can use fire and lightning for example. While naruto can use wind only. Kakashi on the other hand can use all 4. while naturally Some can use only one some can use 2 or even 3. some get to use 4.
No matter what each one has an advantage. having one chakra nature gives u full mastry of the chakra nature and u get the most out of it, having 4 gives relatively fair levels but wider varieties of jutsu's.
I think people should not control their chakra nature or how many chakra natures they use but it should be generated randomly
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