The need to "earth" has only recently come onto the scene. Recently as in, the last few decades or generations. Let's just face it. Most of us have become "city folks." Even if we don't technically live in the big city, we are more likely to sit inside and watch a movie or surf pinterest than we are to go outside and play barefooted. It is what it is.
So what are we missing out on? A. LOT. Believe it or not, when you are connected with the ground, say through walking barefoot in grass or even gardening with bare hands, you are exchanging electrons with the earth.