Was/is it not the case that UK CAA (not sure about new fangled JAA) had the FMC default to max forward C.G for crz? Some airlines were not allowed to alter this as a safety margin. Now we can put in the actual C.G.
What I do find disappointing is that the crews have so little data about how the FMC is calculating the info upon which they operate the flight. Surely it would be a simple matter to have a crew notice in the tech log; indeed should it not be the case: 1.3g or whatever, and at what Cof G. 21st century, high tech fancy equipment and so little information. When there is an accident/incident in a new all bells & whistles a/c, one of the often mentioned items is how much crews are becoming divorced from their a/c by all the automatics. This can only be worsened by keeping them in the dark about WHY it is producing some information. FMC data is often guidance, but how do you know to trust it if you don't know how it arrived at its advise?