In my experience people think it's helpful sometimes, because they know that sunset doesn't mean the light suddenly disappears, but don't know how to act on tha

In my experience people think it's helpful sometimes, because they know that sunset doesn't mean the light suddenly disappears, but don't know how to act on that more predictably. So if you're doing something with people outdoors around twilight, and people are wondering exactly how much light there will be at different times, bringing it up is a good thing.