More broadly, this work signals a conceptual shift in MOF-glass research. Rather than treating composition as an intrinsic consequence of framework synthesis, it becomes possible to view MOF glasses as chemically adjustable materials whose properties can be engineered through post-synthetic modifier chemistry. In doing so, Kolodzeiski, Henke and co-workers have imported one of the most powerful ideas in traditional glass science into the realm of hybrid framework materials, opening the door to a genuine chemistry of MOF-glass formulation.