there are indeed meditation experiences that evoke an oceanic feeling of oneness with the universe, but these are experiences of the God Realm; they are not the mystical experiences that the Buddha described as essential to his psychology of analytic meditation.
Epstein argues that Freud’s oceanic feeling accurately names a real meditative state but misidentifies it with the highest mystical attainment; Buddhist cosmology situates it as a pleasurable but ultimately craving-generating God Realm experience, distinct from liberating insight.
, Thoughts Without a Thinker: Psychotherapy from a Buddhist Perspective, 1995thesis