You could just as easily call medicine "speculative biochemistry" or call chemistry "speculative particle physics". Not being able to model something at the lo

You could just as easily call medicine "speculative biochemistry" or call chemistry "speculative particle physics". Not being able to model something at the lowest possible level doesn't make something inherently unscientific. It certainly makes it harder to test hypotheses and harder to be certain of the results, but it can still be scientific.