It was kin dog expected because Juventus is playing draws almost all the time. No goals was unexpected, I agree. Pretty weird. But Juventus is conceding hardly any goals, scoring any goals. In a certain sense, it was almost predictable.
Talking about defense then I can say Juventus is the team with the most solid defense in Serie A. They have only conceded 7 goals in 12 games. But it seems they can't take advantage of that. They have 7 draws and 6 wins without a defeat. I don't know if they are struggling to create chances or they need a playmaker or a striker with good finishing ability. This is a problem for Juventus because they should have got a better result. But for now I think this is a fair result for both teams. They have equal statistical records in this match. And yes it seems both teams played at a slow tempo in this match.
The risk of a team that tightens up their defense too much is that they find it difficult to score goals, I think that is realistic when Juventus play quite cautiously and they are very focused on their defense so they don't dare to go out or take risks to do many attacks to be able to score goals.
The draw against AC Milan was not so surprising, Juventus have played like that several times against strong Serie A teams and I think a team like Juventus is quite boring to watch.