A long time ago now, I was discussing an article by Toshihiko Izutsu with a group of friends. I can’t recall the specific article at this remove (it was one found in Creation and the Timeless Order of Things), but it was one of his discussions of mystical experiences in Sufi literature. Over the course of the article, he made the comparison between descriptions of musical experience and descriptions of mystical experiences, highlighting how they are both resistant to direct description.
The core of the last post is simple: spiritualist techniques are flexible and can be modified to alter their intensity or quality. That begs the question as to why you would bother to do any of that. If the core practice does precisely what you need it to, why change things. There are at least two answers to that.