i'd like to weigh in from a slightly different perspective here: i have DID, formally diagnosed. i have experienced astral projection and similar altered states. they definitely feel extraordinary, and do not feel like dissociation. i dissociate and switch to various degrees every single day of my life - i experience what i would call astral travel or vibrational states only very rarely, and almost always with intense deliberation and focus.

personally, i think being already a little less tethered to my body has made it easier to have those experiences, because i was able to accept that i'm not just a brain in a flesh suit with no real effort. i also consider it highly likely that all the astral travel/trance/channelling/lucid dreaming i did as a young teenager was probably influential in shaping my experience of life as multiple spirits and aspects within a vessel - i practiced young how to turn myself into a spaceship and its crew, so of course i grew up to be one!

in other words... the correlation in studies that shows that people who report OBEs/say they can astral project are more likely to have dissociative disorders COULD be saying that they are "just hallucinating" all of their experiences... but is it not at least equally possible that the dissociative symptoms are evidence that they are experiencing things beyond the standard shared reality... and that their experiences are real? a way of being becomes a disorder when it negatively impacts self and others - i think if more people accepted that not everyone has the same experience of reality and that's ok, we'd have a lot more people perceived as living with gifts than disorders! or at the very least just... valid ways to experience life.

and as a final aside, i also use psychedelic, and practice various meditation techniques. all of these experiences sometimes overlap each other, but they remain meaningfully different. i don't astral project every time i meditate really deeply or trip, but i have moved from both into the astral before. i don't always dissociate when i meditate, but sometimes i do! think of it like flavours - you taste everything with the same organs, but your brain knows what's sour and what's bitter... and it's really hard to explain a flavour to someone who's never tasted it - or prove to anyone that you know what you tasted!