Literally carry one every day. 90% of the time, when it gets used it's not a need, but it was really nice to have. If you drop a screw or something small, you can either crawl around looking for it for 5 minutes, or you can shine a flashlight across the floor and see the shadow in 5 seconds.

I watch literal doctors and mechanics try to finagle their phones with the light on into weird places and I have no idea why more people don't carry a flashlight.

Sure, not everyone needs one, but if your job depends on needing extra light on a regular basis...