If hackers can take over supermarket freezers, what about the rest of our 'smart' stuff?

BBC piece on the cyber-attack that hit shop freezers across several European countries and what it says about connected devices more broadly. A lot of commercial refrigeration is remotely monitored for efficiency, and those systems often run old firmware on networks nobody really owns. It's not panic-worthy, but it's a good reminder that operational tech is usually the weakest link. For those who work in OT or retail IT: how is this stuff actually segmented in practice?