I think it's pretty silly to include ketamine as a psychadelic to be frank. Ketamine is legal as a horse tranquilizer, which is to say it's primarily a sedative and a CNS depressant. However, high doses can result in a dissociative euphoric state known colloquially as a "k-hole", which I guess some people view as a kind of "trip", the mechanism and psychoactive presentation are pretty different from what you get from e.g. LSD and Psilocybin.

I think the only reason these are grouped together is that ketamine is also seeing a renewed interest in research into microdosing as a depression remedy, but this seems to be mediated by a metabolite of ketamine and may be more of a direct remedy for a chemical imbalance than something like therapeutic trips. In other words, the grouping isn't psychopharmacological, but the zeitgeist of this moment in public perception of these drugs, which has been shaped by fifty-four years of the nonsensical logic of the prohibition enacted by the Controlled Substances Act in the US, some of the trappings of which have also been adopted by other nations, as often happens in a world where US policy has outsized influence both through trade and at gunpoint

Personally I'm skeptical of a lot of psychopharmacological interventions for complex disorders like clinical depression. SSRIs for example strike me as a series of remarkably irresponsible experiments with drugs that appear to permanently alter cognition on wide swaths of the population. I view psychadelics and possibly ketamine as not necessarily more effective overall, but far less dangerous in terms of unknown effects