Darth,
We're talking about feeling the internal mechanations a skilled IMArtist uses to effect structure and power. It can't be learned by just observing what a person is doing outwardly, because all you see is the effect of what he is doing, not the cause and source. Feeling it from the person, connecting to his body, allows you to get a sense of what he is doing under the surface.
A pregnant woman can feel her baby kicking inside her, but the person standing next to her, unless he puts his hand on her belly, has no way to feel the "nuance" of what is happening even if he can see a slight movement on the surface when the baby kicks.
When you have your hand on the belly, you feel the internal movements in far greater nuance than just looking at the surface. And even then, it is not the full message since you can't feel exactly what the pregnant woman is feeling. But it is enough of a hint to figure out some things. Of course, unlike IMA you might not be able to go out and practice getting pregnant yourself to learn fully what is going on,
but my point is that some things need to be felt because they can't be conveyed by visuals and verbiage alone. Another reason why IMA vids don't have much value.