Why is dual wielding impractical?

In terms of firearms, especially handguns, dual wielding is generally denounced by firearm enthusiasts due to its impracticality. Though using two handguns at the same time confers an advantage by allowing more ready ammunition, it is rarely done due to other aspects of weapons handling.

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Subsequently, is a wakizashi a katana?

Wakizashi are not necessarily just a smaller version of the katana; they could be forged differently and have a different cross section. Wakizashi have been in use as far back as the 15th or 16th century. Accordingly, why do samurai carry 2 swords? All samurai carried two swords as both their badge of office and backup weapons, while ashigaru (peasant soldiers) carried only the shorter of those two swords (wakizashi). In earlier periods the longer samurai sword would be a tachi, later the katana.

Thereof, why do samurai no longer exist?

It is illegal to carry swords and arms in Japan. That is why the samurai cannot exist today. In 1868, the emperor Meiji came into power and abolished the samurai system. He stopped the salary payments of the samurai class. What are Zuko's swords? The broadswords that Zuko uses are niuweidao (???) or "oxtail sabers". Niuweidao are characterized by their flat and wide blades, flared tips, rounded cutting sections, and noticeably bent hilt; all characteristics present in Zuko's swords.

Thereof, can you fight with two spears?

You may be able to fight with dual spears, but if you consider what better options there are, then you quickly realize you're only limiting yourself. Some other options: Two-handed spear. With both hands, you can have greater control over a longer spear. In respect to this, can you fight with 2 rapiers? Yes. However, this normally means just that: you have a rapier in each hand. When you take the Attack action, you can attack with just ONE of the two weapons, and can't attack with both of them.

And another question, are renettis still good?

The Akimbo Renetti will only take an enemy from fully-armoured to downed if you're in their face as the recoil on these ramps up very quickly. However, they are superb for moving in to clean up a fight after you've done the majority of damage with your primary, and few weapons fare better if you're being pushed.