Well, when you're playing as Lucia, you get to experience the game world in a whole new way. It's like when you're walking around a familiar city, but then you take a detour down a street you've never been on before - everything looks different, and you notice things you wouldn't have otherwise. In GTA 6, controlling Lucia's perspective gives you a fresh perspective on the game's story and characters.
For example, let's say you're on a mission where you need to sneak into a heavily guarded building. When you're playing as Lucia, you might notice a side entrance that you wouldn't have seen if you were playing as another character. It's like when you're trying to find a new restaurant in your neighborhood, and you stumble upon a hidden gem that you wouldn't have noticed if you were just walking down the main street!