alt Hacker NewsBut it's only the extreme warning that alerts the website (usually via a customer complaining) that the cert hasn't been renewed. Having the lesser warning just kicks the can down the road.
The IoT should have updated the certs weeks in advance. If they haven't done it by day 0 then their process is broken and delaying the scary warning to say day +5 won't solve anything.
A warning with a clear clickthrough button would work for alerting - the default TLS warnings are designed to be somewhat hard to bypass to make people think twice.