George, I am sure that yours is the mind that has more background in this subject. Yes, there is not permanent consistency. The ultimate aim is "A more perfect union," but as the population of that union keeps changing how can there be consistency? We draw the line temporarily. We freeze the picture and guess. Then we make a correction later. This is imperfect but far better in practice than stating a permanent and unchangeable code. Huge problems arise when we deify the code of law. It gets old. It has to be updated. Over time it stops serving unification and works against it, so it has to be revisited and revised.
No, laws cannot provide consistency except in the short term and only as artificial weights and measures.