You admit that there is plenty of recreational and therapeutical use for them and then that leads you to the conclusion that they’re not spiritual gateways. I find this surprising as those are one in the same to me.
Spiritual experiences have been about recreation, understanding others, the self, personal growth, coming of age, etc…
I feel like your post in general is full of acknowledgment of these drugs capabilities followed by attempts to downplay it with pejoratives like “chemical glitching” or “lower dimension”. It’s quiet confusing that you seem to think positively of the drugs but then dunk on them in the same breath.
I don’t think being able to explain, categorize and describe phenomena needs to make them less significant or impact. The mechanism of action being non mystical doesn’t need to change the significance of the experience.
This reminds me of a quote from Margaret Boden about her work on understanding creativity in a academic context.
> A scientific understanding of creativity does not destroy our wonder at it, nor does it make creative ideas predictable. Demystification does not imply dehumanization.