Obviously there are problems with metaphors but my point is that to say the dollar is volatile in the OPs example, he needs to say that all non-Bitcoin currenci

Obviously there are problems with metaphors but my point is that to say the dollar is volatile in the OPs example, he needs to say that all non-Bitcoin currencies are volatile. From the position of relative perspective that may be a valid theory, however in it's not the one best explains what is being observed.