I disagree.

First of all, not all categories are balanced. We still only have 3 casters and 3 ranged.

Second, reworks aren't like adding new classes, they are more like deleting a class to add a new one. You like the new SMN and MNK, but a lot of people who played them before hate the change and had to drop them because of it.
I certainly won't be touching MNK anymore after the changes so for me they effectively deleted a class, rather than added one. And that was just a very secondary class for me, I can't imagine one of my main/favourite classes receiving that treatment.