Regardless of whether or not certain meditative sensations can be replicated with psychedelic substances, here is the point: we don't meditate to feel these sensations or have visions. We meditate to gain liberation, and this includes detaching ourselves from the experiences of meditation. Creating experiences which are artificially similar to meditative sensations does not mean that such practices are skillful and lead to progression along the path. The sensations that arise in the course of meditation are the result of concentration and the refining of the mind. Psychedelic substances give rise to temporary, compounded feelings, not as a result of training in concentration, but through an artificial altering of brain chemistry. These experiences cease and can only be replicated through continued consumption of psychedelics; and, unlike training in samatha meditation, consumption of psychedelics has no Dhammic benefits in our daily lives. Samatha, unlike psychedelics, replaces sensual desire with mindfulness, concentration and renunciation, on and off the cushion. Consumption of psychedelics leaves one with craving for more psychedelic experiences, because hallucinations and feelings of joy and spaciness are fun.
I have taken a psychedelic called LSA before. I thought I would never feel dissatisfied again. I was wrong.
I do not want my house to be walled in on sides and my windows to be stuffed. I want the cultures of all the lands to be blown about my house as freely as possible. But I refuse to be blown off my feet by any.- Gandhi
With persistence aroused for the highest goal's attainment, with mind unsmeared, not lazy in action, firm in effort, with steadfastness & strength arisen, wander alone like a rhinoceros.
Not neglecting seclusion, absorption, constantly living the Dhamma in line with the Dhamma, comprehending the danger in states of becoming, wander alone like a rhinoceros.- Snp. 1.3