It is not essential poe currency from Rskingdom's blog

It is not essential poe currency and will often be undesirable to restrict a personality to using the weapons technical for its course in the early-to-mid game. However, the deeper you delve deeper in to Path of Exile, the longer you're likely to focus on a weapon that's made for your class. Moreover, buffs that improve different styles of gameplay are carried by different weapons within the set of weapons that are class-specialized. Knowing which weapons do exactly what early in the game will help guide your path during the Passive Ability Tree so you have the skills you will need when your character reaches higher levels.

The information in the table reveals that the Duelist is that the weapons master. He could use 12 of those 13 weapon types efficiently. Just the batter is outside his areas of expertise, and also the one and two-handed swords and axes are specialized for his combination of Dexterity and Strength.

The part classes have two specialized weapons each. The Templar and Shadow have nine additional weapons they can use effectively while the Ranger and Marauder possess six.

Every character will find the maximum out of the weapons that are specialized for their course. Opt for the weapon together with the buff which best suits your playstyle. The buffs can be found on individual firearms. For example, some wands will confer increased damage while some increase casting rate. If casting speed is central for a build, your weapon is going to be a wand and you're going to need to buy poe exalted orbs find or craft one that has a casting speed buff.