See, this is exactly what's wrong with open plan offices in most places. If a CEO honestly believes open plan is better for collaboration, then they need to eat their own dog food. That CEO needs to be sitting right in the middle of things. If they find they can't get anything done as a consequence of the collaboration they are in the right place to take action to fix that. And if they are able to achieve productive outcomes, they are also in the right place to argue against people who say it's not possible. Letting upper management avoid all the downsides of the open plan layout causes problems with it to fester and will bring overall worker satisfaction and productivity down. In short, it is bad management to treat management in a special way.