Well, disclaimer — I am a practicing zen buddhist, but it’s something I came to myself, we aren’t recruiting like religions, and there is no dogma or origin myth to believe in.

You’re unlikely to see a buddhist missionary asking if you’ve heard to truth about emptiness on a street corner ;)

My point was simply that, at least in my personal experience, if i had found zen as a tool to achieve something, e.g it was sold to me as having some effect other, it would not have worked.