What the article doesn't mention is that comparatively cheap embedded devices often don't have a very long maintenance life. A year or two down the road there'll be a new, even more capable chip or subsystem which makes the device oh-so-much cheaper to manufacture. At that point, maintenance typically ceases for the original device, and all attention is diverted to the new box.
It would, of course, be desirable to always have updated software, but that's not how proprietary systems work, in particular when the source isn't fully open.
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