Again, I disagree. It's arrogant to say "Hey, X thing I believe in can cure you of Y disease because so many people think it can and you're just ignorant. Nevermind the fact that it's totally untestable or perferms equally to placebo, as long as you feel better it's working!". It's pretty not arrogant to say "Hey, you have a condition that science has at best a limited understanding of, but it might work based on the clinical trials and controlled studies that have been done. It's the best we have to go on, or you could pray."

I think you also mistake "understanding of the universe" for a perceived experience. Just because you did mushrooms at Shambala once doesn't give you a better understanding of anything except maybe why you made some stupid choices in the past.

Why would Yoga be dogmatic? It's exercise.

The tradition of yoga is far more than exercise. Many parts of it, including the exercise, deep breathing, and meditation, are indeed testable and outperform placebo.

Your concept of self is something that certainly happens but is largely outside the realm of science.

Doing mushrooms certainly might impart an understand of, at the very least, the experience of being high on mushrooms. Or perhaps which parts of your perception are merely the reflection of a specific neurochemical balance.

Thousands of practitioners and millions of users also believe in the efficacy of Homeopathy. They are convinced that diluting a substance actually increases its potency! It's not very difficult to find examples of millions of people believing in nonsense. The Placebo effect is very real.

Science hasn't disproven the existence of Invisible Pink Unicorns either. But I definitely would hold off on building unicorn crossings untill we actually have evidence.

Science has, on the other hand, often corroborated common wisdom arising from the yoga tradition.

It's up to you whether to trust the output of the generations before you. In my experience these traditions are rarely categorically wrong.