The principle of Subjective Reality—that the universe is consciousness and nothing more—has been employed by authentic spiritual traditions for millennia. Its intended function is not to reveal Universal Truth, but to prepare a seeker for the next stage in their development by dispelling their material illusions.
In other words, Subjective Reality is a spiritual colonic, which for best results must be followed by healthy wisdom food. New-age teachers who skip this critical lesson are like surgeons who excise a tumor, but neglect to close the incision afterwards.