[nine_k]

Attach a com port, set the date correctly, since you came to replace the battery anyway :-/

Frankly, there is a balancing act between the desire for a device to work unattended for the longest time, and security implications of running an outdated or degraded device. Now that the RTC becomes more important, equip it with better batteries :(

[RedShift1]

You can't expect everyone to do that. Some devices don't have an UART hell some even don't have the pins soldered on to them.

[johannes1234321]

... and then you have consumers, who don't know what UART, serial port or whatever might be, but just want their "smart" appliance to work.