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You could also just try turning it on to see if it has power. I don't see how the light is actually useful for this.
The power draw from a single LED is nearly negligible. If it's a heating appliance, for example, it's several magnitudes more wasteful to turn it on, just to see if it heats properly. Even with other electronics the LED quickly tests functionality with almost zero power without having to power up the entire system which would use a ton of energy, since it assumes it is about to be used for its purpose. It can also be an early warning of failure, I wouldn't use a heating appliance whose off light failed, because if the electronic failed, turning it on could hurt the whole house circuit or further damage the appliance itself. The light is a quick “hey, I need service” warning. Just like cars, those warning lights have meaning and use, they aren't just a decoration.
The power indicator bulbs in these kinds of kitchen appliances are rarely LEDs. They are usually neon indicator lamps. They're pretty durable and have been in use far longer than LEDs.
https://youtu.be/nyYjnV99wfM?si=xq4fxzbOM3ADtBPx&start=106
No, they usually are just LED's these days.