On the issue of a medical, other than cost grounds there is no justifiable reason to argue AGAINST having a medical. It is only the ones that have something to hide that will argue against sitting for one. Besides, as far as the class 2 goes, the important questions are still based on trust that the pilot is honest when they tick the boxes one the first page.
Honesty and a medical vs Honesty...it would not make any difference to me because I am honest to myself( I hope) However, why should the CASA trust me, they do not know me personally.