IMO, without fog, highbeams do better than fog lights + low beams for illuminating the deer sprint starting line. The situation where I do not want highbeams and want fog lights are very infrequent since I’m usually the only car on the rural road.
My neighborhood is somewhat affectionately called Fog Hill. Fog lights would be much more useful if they were amber and could be used without headlights. They don’t illuminate far this way, this is not for driving fast through fog, but does avoid the glare which can make driving really unsafe. I was able to do with my previous car and it made driving that last quarter mile home in pea soup less stressful.