Well, in canon it’s described as similar to having them as an extension of your body, albeit one with it’s own skills and knowledge. So it might count less as “coercing someone into casting” than “casting with someone else’s wand”.
But yeah, it’s hardly impossible to force people into helping you.
Well no, we don’t, not specifically. I’d find it a little odd if it did, but I suppose blackmail or threats or FMCs would also work.
Well, in canon it’s described as similar to having them as an extension of your body, albeit one with it’s own skills and knowledge. So it might count less as “coercing someone into casting” than “casting with someone else’s wand”.
But yeah, it’s hardly impossible to force people into helping you.