Phil, why is 0C too low?
Well, just because it is a 'fridge and not a freezer, really. If you take a liquid out the 'fridge, you expect to be able to pour it straight away, not have to wait for it to defrost. Even running mine at 4
oC, there are colder regions (e.g., right against the back, where the cooler pipes run) that can part-freeze liquids stored there; at zero C they would freeze for sure.
** Phil.