It will now be important to substantially and dynamically extend the HyDRA database in different directions such as larger downshifts, other compound classes, dihydrates, charged systems or spectral ranges, before another blind challenge might follow. Such a second generation blind challenge may decide more clearly between purely harmonic, anharmonically corrected, fully anharmonic and learning strategies. It may also reach a prediction quality which helps to better understand newly discovered anharmonic resonances in hydrate complexes.