A lot of research went into that...that was in fact how they spoke. However, I respect your opinion.
Speaking of profanity, I remember how The Sopranos was criticized for using profanity. But these were New Jersey mobsters! They did not go around saying “please” and “thank you”!
Would the series be better if Tony Soprano had lines like “Golly gee Paulie, that crew from New York is really getting on my nerves. I think we need to arrange a meeting and let them know how displeased we are with the current arrangement.”
Even regular people from New Jersey are not that polite.