I have literally no idea how a person can say it is the same or less complexity as the Cold War. That statement makes almost no sense at all. I actually get the impression you are arguing about it just because, as that would be the most rational explanation possible for the position you are taking.
Complexity refers to the presence of more variables. Do you think there are more variables faced by the US? Of course. I mean that is beyond question. You have North Korea, backed up by China, detonating nuclear weapons and threatening South Korea. You have Russia and China vying for influence over India and Pakistan, who just might end up killing each other. Russia supports India, China supports Pakistan, the US supports both. A half dozen of your Middle Eastern allies are destabilized as hell. Iran is going to get a nuclear weapon. Russia is making power plays in Eastern Europe. Japan and China can't stop posturing, and its only a matter of time before Japan either gets nuclear weapons or militarizes like crazy.
I mean, dude, what on earth are you talking about? I haven't even touched on the various new threats faced by the US, like cyber-warfare or terrorism. Or climate change and the shit that is going to cause.