The existential perspective is also easier to combine with scientific knowledge, which does indicate some tight relationship between the brain and the mind. I agree that consciousness is mysterious, though. I try to explain some of the mystery of consciousness in this article:

https://medium.com/@benjamincain8/the-limbo-from-the-labyrinth-consciousness-and-the-brain-de363f015558?source=friends_link&sk=52d918e56d3fa533aa2a282f28c049f9