harry potter - Why don't wizards use more than one wand in casting spells for battle?

In the Harry Potter and the Deathy Hallows, Harry used three wands to perform the Stupefy Charm to Fenrir Greyback, who was lifted off his feet by the triple spell, flew up to the ceiling and smashed the ground.

Having said this... using more than wand is ABSOLUTELY a quite huge advantage for wizards and witches to win a battle or a duel. If someone tries to cast a spell on someone, particularly the stunning spell, the one that receives the attack will surely fly high up into the air.

The question is, if every wizard in the books wants to win every single battle blocking their way, why don't they use more wands? That will surely help them a lot!

Answer

I don't think there is a direct canon explanation for this.

Logical explanation:

When Harry used three wands it was just a reflex:

He leapt over an armchair and wrestled the three wands from Draco's grip, pointed them at Greyback, and yelled, "Stupefy!" The werewolf was lifted off his feet by the triple spell, flew up to the ceiling...

So he simply did not have time to drop two of the wands and cast the spell with only one. It is unknown whether this "triple spell" caused more damage than the one-wand Stupefy.

In all other cases the wizards use only one wand all the time. If two or more wands provided any significant advantage they would use them.

A real-world example - using two weapons like two swords or two guns is not very easy and is more for the show than anything else. It takes lots of training to master this and still is of questionable benefit. This Wikipedia article explains it in more details: Dual Wield

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