I agree and those microclimates and variabilities in 'terroir' are what make the whole idea exciting! Think about it in terms of species and subspecies, and how heirloom varieties of other plant stuffs are developed. That wouldn't make the term 'landrace' meaningless, it would simply need a bit more refinement, such as... Lago Claro Ecuadoran landrace (I just made Lago Claro up to illustrate the idea), which would speak to that area, just like Burgundy describes a particular wine *and* the region in France where it was developed.
Make sense?