Homogenization is the idea that you give up your class uniqueness in order to gain equal footing in objective power. This happens largely due to your playerbase insisting that they need to be as viable as the other guy despite their own class's strengths or weaknesses. In some cases the changes are good (2.0 Warrior to 2.X), in some cases the changes are neutral (ARR Dragoon to HW Dragoon) and in some cases the changes are negative (ARR Bard to HW Bard)

What we saw in Stormblood was the Homogenization of a 'role'.

Tanks are tanks, melee are melee, casters are casters, and so on. They all must fit within the boundaries of that role to complete the content they aim to do. However

A Black mage does not play anything like a summoner or a Red mage.
A monk plays nothing like a Ninja
Bards do not play like Machinists
Warriors do not play like Paladins or Dark Knights


This is important. All classes are competitive within their role, but none are required to absolutely do content as it was balanced (Day 1 pushing content with no gear is not 'as balanced' when it comes to Savage).

The old paradigm of "Paladin is the most durable thing ever" went in the same vein that "White Mage is the healer, Scholar is the DPS support" went. As more jobs get added, it's the -role- that they are balanced around. Individually, they will all have something that makes them different. (Cards, Faerie, OGCD use)