Originally posted by §P0oONY
If a wand dictated the power why not just give a squib a powerful wand? The wizard uses their power through the wand, the wand itself doesn't give power (unless it's the Elder Wand) therefor having 2 wands is not really beneficial.
And even if multiple wands means being able to fire multiple spells...it'd seem to me that since the power is being channeled through three sources, each individual spell would be weaker than one single one. Also there's the fact that you still actually have to aim where you want to hit. Spells and curses don't have homing devices on them, hence why people are able to miss getting hit and stuff.