I once had the pleasure of speaking to Dr Liddell at a CASA / CAA safety seminar and discussed my then restriction of day VFR, Private ops only on my medical. He explained to me in detail how it had all changed and that I could pursue CPL, IR, NVFR etc. The only argument he could give me at the time for restricting ATPL was busting just above MDA and being able to quickly ascertain on a PAPI that you are on slope. You would hope that the arguments put forward by a medical and aviation professional such as Dr Liddell will carry some weight with the AAT.