Why? I know teens do it for visual appeal, but why use them when not needed. Someone may find it blinding or annoying.

You can't accidently leave them on each time. You need to push the button to turn it on. Occasionally in cloudy weather, I may use parking lights + foglights cuz admittedly, it does look kinda cool and provides extra visibility to other drivers (I have a nose mask). But otherwise, xenons are enough except when there is fog. In which case, then feel free to use foglights. I wish we had rear foglight capability