Molecular Orbital Theory's Core Claim
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Molecular orbital theory treats bonding electrons as occupying orbitals belonging to the whole molecule, formed by combining every bonded atom's orbitals together.
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Combining two hydrogen 1s orbitals produces two molecular orbitals spanning the entire H2 molecule, not one localized bond region.
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This model replaces one localized shared-pair picture with orbitals spread across the molecule; it is a distinct model, not a refinement.