Why should you not have to demonstrate the requirements for an ATPL by means of a flight test?
Given that you already hold an Instrument Rating and are probably operating professionally so as a result are probably getting 2+ checks a year I personally don't see the point. I think that the old experience requirements were probably a bit low and could be beefed up a bit, but if you hold type rating and a instrument rating what more is a ATPL check going to do?
Basically everything you do for the type rating and/or IR will be duplicated in the ATPL flight test. So what's the point other than clogging up the sims and creating jobs for CASA? (What's the bet noone will be able to book a sim so everything will be done at 0300!)
Unless they start making the ATPL test a test of your command ability in which case it will be a complete open ended nightmare.
CAO 40 doesn't say much about the ATPL flight test either. If anyone has a reference could they post it.