Traditionally, practice was performed with the body in that position. At that time such difference could be perceived. Life was different, there was no stress, people followed a natural diet, there was no air, sound or electric pollution, etc. And the East was not a cardinal point but a symbol. People lived in harmony with nature and with the cycles proposed by nature. Today, things are no longer this way; therefore, the benefit of aligning the body with earthly energy will be hardly noticeable.