The only synergy going on here is with the mind. Some of us are more open to suggestion and do not have the background to determine what is feasible vs total BS. It is the way things are and there is no getting away from it. Nature operates on a Bell curve.
Your first point about synergy and some devices being ONLY in the mind is completely false being a general assumption that means nothing for each specific case...
"Some of us are more open to suggestion and do not have the background" is a badly veiled attack or a paternalist remark at best, not an argument at all....Sorry....
And Nature by the way never operate on a Bell curve.... The Bell curve or the Gauss curve normal distribution MASKED the fine graining of reality that percolate trough the visible scale of the Bell and through the illusory normal distribution which is an easy tool that erase the concrete meaningful details ....
« The bell curve satisfies the reductionism of the deluded. »p.242 " Fooled by randomness" Nicholas Taleb an expert on the Bell curve by the way in 5 books...Pick one....
https://www.fooledbyrandomness.com/GIF.pdf I apologize for my correction about your points but it is not possible sometimes to let pass some affirmation that are as free as deceiving....
My best to you anyway.....
«No plane will ever fly... Why?
It is the way things are and there is no getting away from it.»- Anonymus Smith
I can state flatly that heavier than air flying machines are impossible.
— Lord Kelvin, 1895
https://www.scientificamerican.com/article/no-one-can-explain-why-planes-stay-in-the-air/