[FluidDjango]

"...what people have >>known<< for years"

Well: some people. And "known" from their own uncontrolled (in the scientific sense) trials.

Seems to me that the important thing in this report is the systematic research using controlled studies.

Perhaps most helpful was the evidence that side-effects or negative reactions were quite infrequent and were manageable by attendants (aka "guides" in the 60s). Those types of findings might eventually open the door for public funding of research (note that most studies were funded by psychedelic-sympathetic agencies).