And the bullshit stems exactly from it being a potential career death if someone attempted to research them in depth. Without factual and objective analysis the only knowledge left is a hodgepodge of anecdotes, except for the odd Alexander Shulgin or others more scientifically rigorous minded the reports came from users who are not a good cohort of people to objectively analyse their experiences.
MAPS [0] is one of the few groups who against the odds continued to research it, lately they have been advancing research on using MDMA for PTSD, psylocibin, etc. If it wasn't a huge taboo for decades for serious researches to enter the field this type of research would be much more advanced today.
[0] https://en.wikipedia.org/wiki/Multidisciplinary_Association_...