I dont really know why the two are overlapped in this way by people to be honest..I mean it is interesting and if you do enough research it seems clear psychoactive drugs played a role at some point in buddhism..but I think people seek out validation because often others have set psychedelics and buddhism or w/e path at odds.
I dont think they are interchangable necessarily. I also think people should just forget what anyone says and do what you feel.
This is just how I feel about it..I am not drawn to buddhism in it's current state anyway much at all really. I see dogma there(well in the mainstream with the Dali Lama etc) just as I do other places..maybe less so than some other places though.
Buddhist thought is an interesting tool to use at times..in some ways I guess I am like a chaos magician-mixing in w/e paradigm if it's appropriate or useful at the time..and buddhist philosophy is useful at times..but I dont think you can really just meditate instead of use psychedelics and get to the same place (unless maybe you are darkrooming)..you can get to certain states with meditation yes, but in my experience it's not the same exactly. The idea that "all roads lead to the same place" is something I have heard a lot and I have to ask.. why? Who says they do? What if they dont?
I hear people talking about what is "natural" and what is not natural, what is traditional and what is not..I never understood any of this really, it makes little sense to me as it's all just sort of relative. I have had this conversation with buddhists before and I have met some buddhists who seem to be naive and unrealistic about the whole thing..though I can say that about people from any walk of life really.
Personally I think psychedelics grow on the planet becasue we are sopposeded to eat them. The biosphere is alive and we are part of that larger system, we cycle oxygen from it, vitamines, neurotransmitters, water etc..this is just how it's done..that is all that needs to be said really. I never understood people retreating from that cycle and calling it unnatural. I think a sort of neo enlightened animism is what is most relevant atm for humanity..buddhism seems a bit too nihilistic(not in a bad way necessarily) for me to really gather much interest in it at the end of the day.
I was once a person who claimed I was a buddhist though, and I did lots of meditation and far less psychedelics, and read tricycle all the time

I dont really know at which point I moved away from that paradigm but I definatly found a much richer and more fulfilling paradigm for me personally within a sort of personalized blend of various animistic beliefs..though some buddhist though plays a role in there somewhere. I still meditate so there is that.
Im not saying buddhism is not valid..it is just not my path personally. Im more into the practical side of energetic awakening through "shamanic" and yogic practices I guess..empathy and compassion for others is necessary for that in my view but it's not buddhism so I dont call myself a buddhist.
I always liked Ananda Bosmans Ideas of the reimmergence of the "medicine buddha" brining the psychedelic shamanic practices back to buddhism..I have a strong desire to go to nepal someday and explore the shamanic cultures there who still work with psychoactive plants and make what most would call buddhist thankas etc..I guess I am interested in the practices that predate buddhism.
Long live the unwoke.