WR - agreed. However it is my perception (and also I think IOs) that it is pretty hard to infringe CAS with a moving map GPS as long as it is turned on and you keep an occasional eye on it because it tells you exactly were you are in relation to CAS 99.9% of the time.
If you have it setup properly. Mis-selected declutter options, databases, zoom settings, flight plans, etc can all cause you a heap of problems. GPS is just an additional layer of equipment and process that has to be got right to function properly. I really really cannot see GPS moving maps preventing 99.9% of ATZ/CAS/DXXX/etc busts for pilots who would have otherwise come a cropper.