I would like to hear the secret category-theoretic underpinning of the emergent conservation laws as that was an interesting idea. There's a lot of utility in just the biochemistry, and not just in molecular biology. Biologists, chemists, and geologists study how elements move through ecosystems (biogeochemistry) and biochemical reactions make up a big part of how those elements move.

Where the category theoretic ideas might have serious applications is being able to link the small and large scale. Take for example photosynthesis. Photosynthesis is a big and complicated series of reactions (and differs a little bit in different plant species), but most of those reactions are only serve to characterize a simpler "pseudo reaction" CO2 + H2O + Photon --> Sugar, which is the composition of those reactions. So understanding/describing that compositionality and properties of it could lead to insights in biogeochemistry too. I think there are similar potential applications in physiology since physiology of most organisms is mostly a mixture of biochemistry and biophysics

I think it would also be interesting to revisit some of Howard Odum's ideas (unfortunately the lesser known of the Odum brothers) with ideas from category theory / networks theory. Despite having a degree in biology (with a lot of ecology too), I had never heard of his work before seeing it referenced in one of your online talks! His approach to modeling ecosystems using electric circuit analogies and diagrams suggests that category-theoretic techniques might have some application.