By contrast, a speaker may rely on a brief indication because the addressee can grasp the meaning from very little. The demonstrative can thus acknowledge the listener's exceptional quickness of understanding.
In the obtuseness case, the listener misses what has been made obvious. In the perceptiveness case, a minimal hint is enough. Both affect whether the speaker uses an explicit name, a pronoun or a demonstrative.
The same surface form can convey either effect depending on the listener's abilities and the surrounding discourse. The intended judgment cannot be read from the demonstrative alone.