I hardly ever hear scientists or doctors say anything about the subconscious, except maybe when they talk about dreaming. Other then that, I hear nothing.

And then when I actually astral project and read Edgar Cayce articles saying dreams are journeys into the spirit world, it really does make me realize how little is known about the subconscious.

Why is so little understood about the subconscious? I think it's because we're normally only aware with our conscious mind, and realizing what's going on subconsciously would be impossible unless you're aware during it.