The argument here is that psychedelics are more than "chemicals" and comparing them to drifting in and out of sleep is not a real comparison. Can't argue against them sometimes being problematic though, of course, but the argument here isn't acknowledging the real psychedelic experience. If curious, check out some reports on https://www.youtube.com/@Vivec
What I compared to drifting in and out of sleep was merely one effect of psychedelics that people tend to be curious about, namely hallucination. Moreover one can very much approach these dreamlike states with a meditation-like, non-judgmental, non self-centered mental posture, and this is going to make their effects even clearer.