The need to connect the theories is primarily driven by scale. We have one framework that works well for understanding nature on an atomic scale and gives us an understanding of matter, and another framework that only explains nature on a planetary or larger scale. Nature is what it is, and can't have two sets of rules depending on how closely you look at it. Black holes, neutron stars, and similar lie in the intersection of the two theories, and thus observation of them is our best bet at reconciling them, but close observation isn't very possible. In addition, a more mature understanding of mesoscale quantum physics has great potential for application.
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