There are several key progresses in the past years that could potentially lead to a unified theory and mechanism that explains the observed VSC effects. First, the sharp resonance enhancement (condition 1) will show up when using a quantum state description of the vibrational states, which has been demonstrated with exact quantum dynamics simulation , mixed quantum-classical simulations , and analytic rate constant theory based on Fermi's golden rule . Second, using the photonic density of states (DOS) analysis and the FGR rate expression that explicitly accounts for the in-plane effective photonic lifetime, the normal incidence condition (condition 2) can be rationalized . Third, it has been shown that when the N solvent vibrations couple to both cavity mode and a reaction coordinate, the collective effect (condition 3) will naturally emerge , although the resonance condition in Ref. was not ω c = ω Q due to the use of a classical rate theory which is not sensitive to ω Q but rather to the reaction barrier frequency (or more generally speaking, curvatures of the reaction barrier or the partition function that sums over all frequencies). Nevertheless, the solvent-strong coupling could influence the properties of solute molecules as shown in recent experiments . All of the abovementioned theoretical progress assumes a thermal condition without any laser-pumping excitation of the system (condition 4).