It seems to me like most important “non-computer” hardware should not be connected to the internet. Air gaps don’t need to be continuously patched to keep working.
The advantages of a networked supermarket fridge are abundant: being able to load shift the energy usage to use energy company incentives and save money, centralised maintenance and monitoring, being able to integrate with other systems in the store, and probably loads more I can't think of. Flatly decrying internet connectivity is a tired cliche at this point; the focus should be onto securing it to reduce risks.