But we do, and by your logic we can pick any applied statistics, say a Bayesian inference model, and claim we don‘t understand its emergent properties. Heck, we can take any sort of applied mathematics or science, say linguistics, and claim we don‘t understand the emergent properties of language (legal analysis) even though we understand its syntax and phonology.

Yes. That's why law is a different discipline from linguistics requiring its own rules of analysis, pedagogy, etc.