We emphasize that our comparison with CDFT is not meant as a critique of the latter, but the contrary. By building bridges between theoretical frameworks, and highlighting commonality and complementarity of different perspectives, we become better equipped to analyzing and understanding electronic structure and chemical transformations. A notable merit of the CDFT framework is the establishment of a series of electronic structure principles connected to reactivity, such as the "|Δµ| big is good" rule 121,122 and the principle of maximum hardness. 123,124 A detailed discussion of these principles within the EQC framework is beyond the scope of this work. However, we note that any principle based on the chemical potential will remain valid within EQC, even as a given value may find a complementary interpretation through Eq. ( ) or (9). The principle of maximum hardness is likely to remain valid in EQC. We postulate this as both the EQC and CDFT definitions of chemical hardness result in strong connections to polarizability, and because the response to electronic perturbations is invariably linked to the HOMO orbital.