And sure Vince may get the final say (and to be honest I'm not as sure as some people that this is as prevalent as it used to be), but psychologically it's much more difficult to say no your idea stinks and we're going to change it to your own flesh and blood offspring than some random porker you're paying a paycheck to.
But he does have that power, so ultimately the blame falls on him. I think we all know Stephanie is grossly incompetent, but it's no different than giving your infant the keys to your car. Yes, they drove it into the tree, but you let them do it.
It damn sure wouldn't stop me from telling family their idea sucks, every waking hour if necessary, and Vince is a lot more cold blooded than I am.