>>124042936I think they chose Simon to be the villain, proclaimed he was a narcissist, and since he's the bad guy who is going to die anyway, they didn't need a consultant. A consultant would've told them that how they are writing Simon is more BPD than NPD.
But I also think they never expected anyone to disagree with their thoughts about Simon, and for the most part they're right so far. Most take season 3 at face value and won't challenge themselves to examine it deeper.
So no, they didn't cheapen out for a consultant. They just never thought they needed one, and never thought deeply about what NPD really means and how they chose to portray it.