Why put so much searchable stuff in the game like DOS if it's more immersive for people to just blow through all the areas without exploring, and just doing the main quests?
To create the illusion of depth, and that this is a fully realised world independent of the adventurer, rather than one that is created specifically for the player to interact with. This may not totally work, but I assume is what Larian are going for by putting so much stuff in that a player isn’t necessarily going to be interested in, and I personally appreciate their effort.
As a result, I’d prefer to try to preserve that illusion as far as possible, and enjoy that as and when I want to dig deeper or explore more thoroughly there is more to be found before I hit bedrock. So if there is a feature that makes it obvious what exactly is present in an area quickly and easily, I would definitely like to be able to toggle it off.
But as I mentioned before, it’s not a huge thing for me so, as you say, we’ll see, and whatever Larian end up doing I’ll live with.