I encountered an infuriating example of the opposite a couple years ago: a gas stove that wouldn’t work without electricity.

A gas stove normally operates with a mechanical valve to control gas to each burner, and while modern ones have electronic igniters, it’s possible to use a match or the like instead. These assholes went out of their way to add an electronic valve that shuts it off when there’s no power. It’s probably in the name of safety, but the scenario where someone leaves the valve open without igniting the gas is possible even with power by failing to engage the igniter correctly, and gas is smelly.

I should be able to use a gas stove when there’s no electricity or the igniter is broken if I supply my own source of ignition.

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For your example of a flashlight, consider one with USB charging. If the charging port or circuit fails, I should be able to easily take out the battery and charge it in another charger (Li-ion charging is pretty standardized). If the battery is dead but the USB port works, I should be able to use it as a USB-powered lamp.