What is the actual purpose of lbrp?

when i started reading about magick, lbrp was said to be an energetic sterilization of the environment so the lower entities are banished and you have a clean slate to perform your rituals.

now LTC and others say it functions to externalize the disturbances of the psyche to make you aware of what needs to be resolved. I know people disagree with LTC here.

But I'm confused what is the true purpose of lbrp