The souls incarnating on Earth, choose the Earth mostly because of the richness of emotional life. Our emotions are rich, strong and colorful. Our world has much darkness, much light and many colors in between.
Moreover, our minds are fragmented; so many emotions are formed by interactions of the fragments within the individual mind.
The majority of humans have neither telepathic nor psychic abilities. This makes humans very isolated and lonely. Many humans on Earth believe in various forms of gods and spirits, but they are still not capable to hear from these gods and spirits directly. So the typical way of communication is unidirectional: we talk to the gods and spirits and judge the response of them via the luck and misfortune in our life. Sometimes, on average very rarely, humans use psychics, shamans, mediums and priests to hear back from the gods and spirits.