I would say it depends on how they test films, and to what contrast they develop them.

If you remember old Agfa APX spec sheets, they would publish curves and development times for three different gamma curves.

It could be that Fuji's testing methods are simply different from other chemistry manufacturers. Either way, to make a fair comparison, whatever developers you are comparing, they must be developed to identical contrast to bear validity. This requires fairly standardized procedures, a precise lab environment, and all 'other things' equal.

The layman's version is to make negatives that print well on the same paper at the same contrast grade and magnification.