Board Thread:General Discussion/@comment-1875854-20150221232630/@comment-4961229-20150223045844

Using imagination to control your chakra doesn't equate to changing the ratios of yin to yang IMO. Naruto used his imagination to construct his rasengan. We are treated to a step by step depiction of how this occurs. This has nothing to do with yin and yang manipulation; it's pure shape manipulation. Similarly, using your imagination to control the change of nature has not been shown to have anything to do with yin and yang ratio control.

But as you said, perspective.