There is only so much to learn from the examples of others , what is written in the classics , or even from a living teacher. Right?
So , at some point , when one feels that they have the basic plan under their belt , they then need to apply it in the complex real-time world.
One can try to master the entire world , to know the perfect response for every situation , and so forth... (but because none of us see the future completely and in detail ,, the right thing to do is often a thing we must guess at).
That's why Tao is called or described as an ally , its not the be-all end all answer to- Life , the Universe and everything.
It doesn't make one infallible or perfect - but the understanding of it should enlighten one to the fact that there is no perfection other than to say things are already what they are and are not deficient or imperfect, since that is a subjective judgement ( that implies expectations of what, rightfully, things should be ,,and are not) .
So there is no 'whole system' which includes all the applications , but there IS a 'whole system' in that all the hints given ,can add up , to all the hints garnered.