As noted in Ref. 18 and confirmed above (using both XSAPT+MBD and PBE+D3), electrostatics alone does favor offset-stacking in COF-1, although the authors of Ref. 18 rationalize this using a common trope about repulsive nuclear-nuclear and electron-electron interactions that has been thoroughly debunked. The EDA used in Ref. 18 is essentially a periodic version 66 of the Kitaura-Morokuma scheme, refined for use with DFT, and employs a quasi-classical electrostatic analysis based on isolated-monomer charge densities. This is consistent with the definition of E elst in XSAPT, and this definition of electrostatics is often attractive at vdW contact distances (meaning E elst < 0), even in cases where leading-order multipoles of the monomer charge densities suggest that electrostatics will be repulsive when the monomers are well separated. Indeed, the original authors of the periodic EDA scheme note explicitly that the electrostatics term is usually attractive. We investigated this by performing SAPT+MBD calculation (with no charge embedding) using the PBE functional to compute the monomer charge densities. Although this type of "SAPT(KS)" calculation strongly discouraged when combined with density functionals (such as PBE) that have incorrect asymptotic behavior, 37 such a calculation does allow us to obtain quasi-classical electrostatics based on a PBE description of the monomers. Two-dimensional scans of the energy components computed at the SAPT(PBE)+MBD level for (COF1) 2 are shown in Fig. , which should be compared to XSAPT+MBD results in Fig. . The electrostatic surface is in semiquantitative agreement at both levels of theory, so indeed the PBE electrostatics predicts an offset but the well depth is significantly shallower than E int . The vdW surface from the same SAPT(PBE)+MBD calculation (Fig. ) is a better overall match to E int , with E elst as the last bit of the interaction energy that enhances offset-stacking. The SAPT(PBE)+MBD calculations predict a lateral offset that is consistent with XSAPT+MBD, and smaller than that predicted at the PBE+D3 level.