The previous and old theory of superconductivity was that of the BCS which relied upon electrons-pairing. That notion is similar to electrons sharing an orbital, or orbital sharing. So, orbital sharing by 2 electrons is not far from the BCS theory of electrons pairing. We can omit electron pairing as a mere wish, and not really physics. But we cannot omit orbital sharing of electrons.
Orbital sharing is a fact of atoms.
The BCS theory is a sham, a fake theory. Geometry breaking relates to superconductivity. Not as in the fake BCS theory of electrons pairing. The answer is that the fact of pairing is unrelated to less or no resistance. So the BCS theory is a fake.