Kill the wizard first is a time honored strategy. Wizards are glass cannons and you want to break them before they can get the fireball off.
But with the homebrew rules, the AI is wrong. The HP bloat / AC reduction nerfed the spells and the AI should be trying to take out Laezel.
I'd have no problem with the AI if the assumptions behind it were correct.
True story. It's always Laezel and Astarion shredding the enemy while they expose themselves chasing Gale.
Even if it makes sense to kill the mage first, you wouldn't do so at the risk of getting cleaved or stabbed in the back by the fighter/rogue that's in arms reach from you.
