Going Wizard implies high ranked magic.
Getting multiaggroed when you have 2000 range multi-target spells that can deal 3000 base damage and/or immobilize for 3-8 seconds, followed by a knockback regardless of passive defense - and you still need Windmill means you fail pretty hard.
If I use Windmill with Advance Magic, it's mostly for lulz because hitting multiple targets is fun. I've very very rarely ever needed to use it to get out of a messy situation. Plus Wand stun is pretty fail. Saying that there are some mobs you can't defeat with magic isn't very strong either. Aside from magic-immune mobs, there's nothing that stunlocking can't solve, and Firebolt and Ice Spear handle that pretty well.