not so much confused as hitting a brick wall ...

I want to write an email jointly addressed to oneworld Alliance Management Company, Asia Miles, Cathay Pacific and British Airways.

Just why are so many companies so secretive not providing a transparent channel of communication I ask myself ?

Does anyone out there have an email address for the oneworld Alliance in Vancouver ? the only two I've tracked down are the press office and their privacy address

A great big ^ 's up if you can !

I doubt that OneWorld thinks of itself as having much to do with individual passengers - they're a consortium of airlines, and do consortium things. I believe their relationship with the member airlines is no more than to provide a forum in which the members can execute mutual agreements, so a complaint about a member to them will be a waste of time - vaguely like compaining to the United Nations about your neighbor's dog. The appropriate government department in Hong Kong or Britain will have vastly more influence over the respective carriers.

OTOH if you have a consortium-level suggestion, like why they should have their next meeting in New York instead of Geneva, the press contact might field it for you.

You're right - they're (purposely) intensely private. Even the domain contacts are private.