>>>Do you have WiFi at home? Most people do. In the case of this IoT dishwasher I suspect it's WiFi only, no wired option available.
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>No wireless here... or intermittent wireless for an hour or 2 per day, e.g. to download OS updates or big apps. Instead I commissioned 5km of network cable during a big renovation. But this Miele dishwasher has a long network cable, with instructions that it's only to be connected by an approved technician. I wonder whether this researcher plugged it in himself without the protective settings Miele intends.
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As I prefer tablets for cursory reading/browsing, WiFi over here is nearly always on, although I am the only one in the house allowing new devices into it - with stern admonition for those people having access given temporarily or permanently not to install reverse lookup tools, which would enable them to "know" the pwd for the secondary net. But some of the newer devices (TV switching over to a new standard on 29.03 for instance) have WLAN built into it - without even a HW switch to turn off power to that particular switch set. And more and more offerings NEED internet access to function, like HbbTV channels - with cabling I can disrupt connectivity at least on HW level.

Probably some time in the future another subnet layer will grow for such devices over here ;-)

>>>You might get the impression I'm not a big fan of WiFi for LANs ;)
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>Nor am I. Multiple wired POE ports in every room.

>As noted, I wonder whether Miele had an opportunity to set this up properly, or whether the researcher plugged it in himself and confirmed that security wasn't yet implemented.

Few years ago similar hoopla for smart central heating - there the connectivity clearly was intended to be always on starting with installation.

Currently no problem to buy old-style devices. But in next decade it will become difficult to escape hackable devices if one needs a replacement. TV certainly problematic, monitors soon to be. I do wonder what my next car will be - current big one very nice, even if 12 years old (another one with less cylinders and HP available for inner city driving in bad weather - on nice days motor- or bycicle used for small hops), but since Dieselgate by VW the pressure to replace whole groups of otherwise fully functioning car groups by disallowing them into inner cities might force me to choose between a hackable one built after 2015 or a true oldtimer as defined by our KBA, which means 30 years old at least to escape such regulations as emission standards.