Your question concerns the quantity of information that can be necessary to completely explore the thematic arguments in a story. You ask, do all 72 arguments (interactions) need to be there? The answer is, yes and no. To completely argue the thematic issue, all of its relevant positions need to be made. HOWEVER, the depth to which this is done is COMPLETELY at your discretion. For example, you can illustrate Self Interest v. Morality in a single sentence or observation: "I slave day in and day out for our family, never taking any time for myself, and all you think about is getting more money so that you have a nose job!" That simple example (I have no idea where it came from) could easily act as the exploration of one of the 72 thematic issues. If you're an adept and clever writer, you can be far more original and succinct in your own examples.
Whatever you do, at least address the thematic conflicts in each of the four throughlines. Otherwise an entire aspect of your story will be noticeably absent.