[tsimionescu]

You're giving a (very weak) reason - personal experience while in altered states of mind. Of course, people doing at least some of these practices also personally experience all sorts of other false things, many which they themselves don't believe when outside the altered state, such as vivid hallucinations.

[hackable_sand]

Altered state and personal experience are still a part of the fabric of reality though... They are just different configurations.

Granted only a few people have been able to transcend materialism since the beginning of history, but it's all the same either way.

Reality is axiomatic. Either we're here and a part if it or reality doesn't exist.

[tsimionescu]

Let me put it like this. When taking psychedelics, you may see long dead people, hear voices, etc. These things are real experiences, but that doesn't mean that the long dead person really came to visit you, it's just a construct of your mind under the effects of the psychedelic. That experience is of course an aspect of reality, but it is not proof that dead people can sometimes re-materialize and visit us. Not even the person who had the experience believes that (usually).

So in the same way, if under the effects of psychedelics you get a sense that everything around you is conscious in some way, that's a valid experience, but it does not mean we should take an absurd idea like panpsychism seriously as a theory of reality.