There was no conclusion to the events that preceded it. It doesn't matter if time had passed.
How was there no conclusion? Superman saved the ENTIRE WORLD from the world engine in the Indian Ocean. Then, along with the US military saved Metropolis by sending the remaining invading Kryptonians into a worm hole. Then he saved the rest of Metropolis / Humanity from a vengance fueled Zod who just realized his Superman like powers. Oh, and saved an entire family from certain death as well.
Not enough of a conclusion? Or are you talking about the after shocks of such an event?
Which is briefly touched on in the scene in discussion, given the military is using a drone to try and spy on this alien with god like abilities. The military wants to ensure he isn't acting against America's interests.
Which Superman politely re-assures he's American born and bred, as well as ultimately here to help. Yet Superman also defiantly draws the line, refusing to at the same time to become a government lachey as well.
That's not conclusion, or addressing the aftermath of such an event to you? And then the very organic basis of the sequel to Man of Steel, Batman v Superman, tackles the rest of the issues head on in order to initate the conflict between the protagonists.
So what's your beef?
Meanwhile, in a film such as Avengers, there is no follow up to the ending of the original where members of the government are concerned the team was equally responsible for the alien attack. And to start Age of Ultron, the team is operating out of a very public headquarters in downtown Manhattan, and going into countries in battle with impunity.
THAT is an issue. Or the fact that the whole team is all hugs and kisses after Tony created an AI that destroyed an entire city (conveniently Disney-esque with no tragedies to bring actual tension to such an event) ... THAT'S not having a conclusion. That film should've ended with Cap and Tony hating each other, as well as Stark being taken into custody by the military.
