Diafine improves noticeable after you put a few rolls through it. Once it has 'ripened' a little your negatives will become noticeably smoother and take on a pearly appearance.
Certainly if bath A changes with time it is not ripening in the traditional sense as would occur with replenished developers. Since bath A is acidic no development should occur in it. So just what would explain any ripening. This is the first mention of this phenomenon and runs against Diafine's claims that development remains uniform throughout the developers life.
A rock pile ceases to be a rock pile the moment a single man contemplates it, bearing within him the image of a cathedral.