Short answer: Yes, you need all of them.
Long answer: Crafting in this game is most profitable if you are able to make High Quality (HQ) versions of the different recipes. In some cases only HQ is acceptable, such as with various quest requirements, relic components, etc. So being able to reliably make HQ equipment is very important. In order to achieve this, you need to have access to certain skills which can only be learned by specific crafting jobs. Each crafting job has unique skills, and you'll need many of them in order to produce a crafting rotation that enables you to reliably produce HQ items. Some of them you could arguably do without, but in fact most of them are useful in the right situation. So leveling every job is recommended in order to have access to the full array of crafting skills. When you reach level 60, you'll gain access to specialist actions which can only be used by specialist crafters ( you can only choose 3 crafters to specialize in). So you may be thinking you can just level the 3 crafts you plan to specialize in, but in fact, the specialist actions are mostly unreliable as they rely heavily on the condition of the craft which is decided by RNG. When you're trying to make HQ as reliable as possible, you want to minimize RNG as much as possible which means that the specialist actions in general are not viable options. This means that you'll continue to rely on your skills learned from all the crafting classes even after becoming a specialist.
All that said, before you go and start leveling up every crafter to 60, you should decide if it's really worth it for you. Crafting in this game is primarily used as a way to make money first, but also has added benefits such as being able to repair your own gear, and meld your own materia (which will become very important in 3.2). If you find that you don't really need money for very many things, then it's entirely acceptable to just level the relevant crafters you need to meld and repair up to level 50 and stop there. If you're fine with having someone meld your materia for you and using the repair NPC, then feel free to ignore crafting entirely.




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