Why are arcanists left handed?

[Penthea]

It's because the book is considered a weapon, so like any other weapon it's held in the right hand.

[NessaWyvern]

It's because the book is considered a weapon, so like any other weapon it's held in the right hand.

I was thinking that the astro weapon is in the left hand, but then I remembered that the auto attack is done with the right hand with a card. So the card is the weapon?

Most people are neither left nor right handed, actually. Most people are right-dominant or left-dominant. That means that we are right-handed or left-handed in most situations, but the reverse is true under certain number of cases.

As for hand dominance, my left hand is stronger, but my right hand is more precise, so I swap between them based on what I need.