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No WiFi, no AWS (as far as the mattress is concerned). "Works without WiFi" would be sufficient but not necessary for functioning through the AWS outage.

Right, but during the AWS outage that took these beds out presumably most of the owners had functioning WiFi.

Yeah, "works without any internet connection at all" is perhaps overkill for an AWS outage but I'll allow it.

But it should still work without functioning WiFi.

I'd venture to say that the person meant that these kind of devices should be designed to work "locally first".

I think perhaps they mean it should just run locally, rather than without an internet connection at all