No, I don't agree with that...
For me 5-MeO-DMT is a spiritual experience like this one:
http://www.bluelight.org/vb/threads...ne-100-mg-MXE-IM)-Experienced-Tripping-Globes
but it's psychedelic potential is relatively more limited, which can be explained by high 5-HT1A activity compared to 5-HT2A. DMT isn't so selective and acts a lot on 5-HT2A which brings a lot more content into the trip like worlds and beings, shapes, patterns, although it still has that spiritual undertone.
I think both are overwhelming and that makes them a bit terrifying, but on the whole the atmosphere apart from that overwhelming should still be positive quite more often than negative, for both. 5-MeO-DMT is more purely about the feeling, the arrival, the state of being although there can still certainly be freaky visuals, but less abundant and colorful. DMT is more about the journey.
I don't think 5-MeO-DMT is dark, virtually every time I have taken it the trip had heavenly qualities. Sure, at times - maybe parts of most trips - it was simply too intense to bear but only rarely did it feel sinister to me. For DMT that was similar although the difference between harmony and chaos is easier to describe because of the psychedelia that goes with it.
LSD vs mushrooms is a different comparison to me: to me both are very psychedelic and both can be spiritual even if mushrooms more heavily in a shamanic way somehow... but they have a different approach / character. Mushrooms are irrational, emotional and intuitive to me. Fairytale-like but obscure and mysterious. LSD is also profound but more honest and rational to me although it can have pretty much the same challenges as mushrooms if the dose is high enough. Still, rather than fairytale-like the themes seem more neutral and flexible and pure: like synthetic yet realistic-natural looking caricatures. Mushrooms tend to charge caricatures with more projections of fears and desires in my experiences. The ways it works or the mind works and how the mind constructs reality get more mythical and involve strange beings controlling alien control panels, of which I am shown mysterious visions. LSD allows me to partially see and understand how things may relate, there may be visuals of symbols making up a matrix-like world but less delusional.
Don't get me wrong, I can still lose contact with reality on LSD but the crazy things that happen don't seem to imply quite as much supernatural stuff. I find the way my head gets messed with more friendly and I feel like on LSD the deep lessons and questions are more fair and explicit. On mushrooms it's more like some asshole kung fu teacher who demands the answer to profound questions that were not explicitly asked. Sometimes it's a very good thing to get punished by mushrooms and humbled a bit, but many other times it just seems cruel to me.
By the way I bet if selective 2A agonists like NBOMe's weren't so unsafe, esp to combine like the following, they would be great to combine with 1A heavy and maybe some 2C contributing agonist to fix them being hollow and superficial. Also too bad that a lot of 5-MeO tryptamines can be a little iffy with the stimulation... apart from that maybe they could make other psychedelics more spiritual. If I were still more experimental, I might try to find a good formula operating under the admittedly quite overgeneralized assumption that 2A contributes a lot of classic psychedelia and 1A more of a spiritual component, and 2C maybe some - what - effects on mood etc on the side?