The two-decade arc of quantum-biology research on photosynthetic energy transfer has, over 2016–2023, undergone a substantial empirical and theoretical reassessment. The 2007 Engel et al. Nature observation of long-lived coherent oscillations in the Fenna–Matthews–Olson (FMO) complex at 77 K, followed by the Panitchayangkoon et al. (2010) demonstration that comparable oscillations persisted at physiological temperatures (277 K), generated the influential “warm and wet” hypothesis: that photosynthetic light-harvesting complexes exploit long-lived electronic quantum coherence to achieve near-unity energy-transfer efficiency, operating outside the conventional thermal-noise regime where decoherence should rapidly destroy electronic superpositions. The subsequent reassessment — anchored by Duan et al. (2017), who showed that electronic decoherence in FMO occurs within 60 fs at physiological temperatures, Thyrhaug et al. (2018a), and the Cao et al. (2020) 18-author consensus review “Quantum biology revisited” — has shifted the working consensus toward the interpretation that the long-lived oscillations originally attributed to electronic coherence are dominated by impulsively excited vibrational coherences rather than functionally relevant electronic superpositions. Wilkins & Dattani (2020) further argue that even if some inter-exciton coherences persist, they do not measurably enhance energy-transfer efficiency above incoherent Förster-type predictions. The Mirkovic et al. (2017) comprehensive review provides the framework against which the post-2016 reassessment is interpreted. The principal aim of this article is to formalise the cross-claim evaluation of the surviving quantum-coherence proposals through the Photosynthetic Coherence Functional Relevance Index (PCFRI), a normalised composite metric bounded on [0,1] that integrates five evaluative dimensions — spectroscopic detection robustness, origin specificity, decoherence-vsenergy-transfer timescale ratio, functional-role demonstration, and in-vivo relevance gap — and returns a quantitative ranking of competing claims. Applied to five canonical claim categories, PCFRI returns values in the 0.15–0.50 range, indicating that no current quantum-coherence proposal achieves the “demonstrated functional relevance” tier and that the post-2016 reassessment has, on the PCFRI calibration, empirically vindicated the sceptical position of Wilkins & Dattani (2020).