It's not a warning, it's a fail-safe. It's likely the sensor on the battery failed, so the heat sensor was all that was left. A user can guess at the problem b

It's not a warning, it's a fail-safe. It's likely the sensor on the battery failed, so the heat sensor was all that was left. A user can guess at the problem based on the temperature of the laptop. I've had my laptop turn off like this and I always let it cool down before powering it on again. You can argue that Apple needs more protection for issues like these and needs to message users better about how to deal with the behavior exhibited by the laptop, but you can't say that Apple does nothing or doesn't have any sensors.