-Camera tricks! I'm neither a game expert nor a cinema expert nor a camera expert, but I know Larian has these things in mind. During cinematic moments in the world, use the camera to give us a sense of intimacy with characters (proximity sense, already being done in a way), but also pull the camera to the side and a bit out from being really zoomed in like in the prologue showing the sheer size of the Nautilloid. You can make things seem much bigger than they are with camera tricks. Camera angles are also good for that.
-Let players set how they like the camera in a fixed way. If someone wants a more zoomed-in, slightly over the shoulder experience that you get when you zoom in really far to capture a character's field of view, let them. It can be immersive. If someone wants to zoom out to get a full isometric effect, let them. That's immersive in a different way. Different strokes for different folks, but camera tricks are great at shaping a landscape and its characters (like the initial trailers for BG3 demonstrate). It's already almost seamless, but sometimes a preferred camera setting is overriden by the structure of an area. Provide tilting camera if zoomed in? Then take it away when you start to zoom out more and more.
