There's a lot of things we do on a regular basis that we don't need to do, but are good to do regardless.
Personally, even if I lived in the woods and never interacted with other people I'd still shower every day because when I wake up in the morning, I physically feel disgusting until I've showered.
Personally, even if I lived in the woods and never interacted with other people I'd still shower every day because when I wake up in the morning, I physically feel disgusting until I've showered.