Patlabor 2 features scenes of characters speaking at length, weighing, rationalizing, and speculating about the world and its history. Oshii is a thinker, and this is the most blatant way he shows it in his films and tries to share his thinking with an audience. Dense and memorable words can easily distract from the other elements of a film. There are also many who will say that a film isn't supposed to have a "message"; such things would be better conveyed through nonfiction media. Many of those viewers will tell you a movie's effect comes not from its "ideas," but its moods or illusionism. Films have many dimensions. We all know they can profoundly affect people's thinking and behavior. Some people deny art affects reality at all, but I don't even think those people really believe that. Still, it is true in some respect that "messages" or "ideas" don't have the significance a lot of people attribute to them....
"We are in the world, not against it." - Ursula K. Le Guin