As I'm on a bit of a POV hobbyhorse at the moment, I would have to say that this analysis itself is only two-dimensional.
With our 1st person and close 3rd person POVs, we are meant to inhabit the POV character and observe what they do, through the prism of their prejudices. It is all very well having a slightly-bigger-than-minor character (Char A) with a full knowledge of, to pick a topic at random, antiques; but if the POV character (Char B) can't tell a Chippendale chair from a male prancer**, the narrative shouldn't really be dwelling on that Char A's love of inlay or marquetry. (Silly example, I know, but imagine Char A is an expert on armoury, but the POV has lived up a tree in the forest all his life and is only interested in the various uses of squirrels; Char A is not going to get a very rounded biography, unless they become a POV or meet one with a little more experience of arms.)