To speak specifically to "why are these new weapons class-specific?" - the development team plans to implement a variety of equipment that meets and fulfills all types of needs for the adventurers of Eorzea. It just so happened that those implemented this time were class-specific. With this said, it wasn’t their intention to try and change battle balance or force any particular type of play style because of the implementation of class-specific equipment.

To address the question about "Why are these types of items in the new recipes when they were removed in a previous patch?" The reason why nuggets were removed from recipes alongside the recipe adjustments was due to the fact that many low-level recipes had multiple steps in their recipe making them overly complex. It wasn't meant to be taken that they would never be used again in the future.

As we stated previously, the below is the plan for new recipes:
-Low level: No multi-step materials, easy to craft
-High level: Multi-step materials, high difficulty

The recipes added this time were high-level ones.