> We've had clocks for decades that synchronize to atomic time sources accurate to within 1 second over 100 million years that automatically correct for daylight savings time that do it all by just listening to publicly available radio broadcasts, no wi-fi or information harvesting required.

In the US we have:

https://en.m.wikipedia.org/wiki/WWVB

> WWVB is a time signal radio station near Fort Collins, Colorado and is operated by the National Institute of Standards and Technology (NIST).[1] Most radio-controlled clocks in North America[2] use WWVB's transmissions to set the correct time.

Radio time has never worked for me in Boston on any of the devices I've owned. I'm sure I'm not alone. It's simply too far away or there's too much interference or both.

Atomic clocks are less reliable and require more expensive circuitry. Everyone has wifi and a simple SOC that has everything needed to run the oven, display, and do WIFI at the same time can be found for pennies. Plus, internet connected is a selling point.

Huh? Wifi soc is way more expensive than a statically tuned radio receiver. The atomic clock isn't in the device, that's the point.

I was thinking more of the case of poor reception where you need a receiver outside and the device is inside.

Ok, I did not know about that. Why isn't this more popular? I have a fancy $1000 high end microwave that does not have wifi and does not sync its time. We've learned to ignore its clock.