I'm not sure I agree with you, because I can think of at least three occasions (Cagliari, Chievo and Lecce all at home finished 1-1) last season where Juventus scored early against small opposition and ended up conceding. I don't think the problem has changed from then till now, because the team has more goals than what is being showed, yet it's lacking an important component. Even this season Juventus has become a second half team and taken Siena, Parma, Genoa, Napoli and Bologna out in the second half and quite late on in the match.
I don't think it matters when the goal is scored, nearly as much as how the goal is scored. And who will be that guy to put away 20 goals for Juventus each season?