So they can monitor if something goes wrong, have a tech troubleshoot and deploy with the right parts.

Modern HVAC and fire control b systems for buildings are often connected now as well

You can do that while gapping the actual fridge function. Network connected temp probe and dumb fridge. These sort of systems are used in lab setting where its all dumb fridges and freezers, and very precious things inside.

Yes it was more of a rhetorical question, e.g. maybe we need to rethink that whole idea of plugging everything into the internet and instead go back to air-gapped "local area networks".

It also wouldn't be a big deal when a supermarket employee makes an old-fashioned phone call (gasp!) to the refrigerator service company when some red light starts blinking ;)