Originally Posted by
Blumie
They don't, but they can sometimes provide some useful information. In this case, as the OP speculates, it may be the case that AA is restricting F sales so that it can oversell J and roll passengers forward if necessary.
Nonetheless, undue weight should not be placed on the seatmaps.
That would be a very poor move on AA's part, and I can pretty safely say that is not what's going on.