I think the potential and 'multitalentedness' of INFJs is just their perfectionism. An example is that I'm good at drawing ONLY because I control the pencil like Stalin and my eraser seems to disappear after an hour or so of fixing mistakes drawing. I can do anything if you give me enough time and some motivation/inspiration, but I can't do many things quickly. To me, talent is when things feel natural and quick. I don't have many talents besides writing and maybe music playing, but I have an ersatz jack-of-all-trades-ness that perfectionism/idealism gives.
I find I do best when I do not think about The Ideal, but rather, develop ideals out of real information. This usually turns into seeing the potential in people which in turn gives me a warm, fuzzy feeling inside.
I think INFJs just reflect their upbringing in a different way than other types do, so they seem very different among each other but still different from 'normal' variations of different. It makes them seem MORE different from normal people, when really, they are affected by how they are raised just like everyone else, but express it differently.
I fit in the Ni-heavy variant that tends to switch which function Ni works directly with depending on the situation and my mood. When alone it works with Ti, when I'm challenged or doing something it works with Se, and when with people I find interesting it works with Fe.
But first and foremost, I am an escapist while still trying to enjoy nonvirtual reality. Which is what friends are for!