i dont think tis actually related to the tadpole, i think its simply because in a campaign, you plan around that sutff, you wait till its night, you know where to set ambushes and all that.
in a video game you cannot do that.
The tadpole in general seems to be an excuse to alleviate things that DnD doesnt "let" you do. Or more to the point, that DnD wouldnt otherwise let Larian do.