The nanotech mind-control isn't "all of a sudden" at all. I started talking about that months ago, even connected it with MU continuity via Contest of Champions II. It's the exact opposite of "all of a sudden", it's the big thing I started working towards from day one. Everything else I did was just to get the dominos in place to mass-produce the nanotech, something I hinted at constantly in my posts. I hinted about building towards this in both IC posts, and in OOC posts here where I summarized my actions to keep people from falling behind. Months of this.
I went about this very much the way a Mandarin story happens in the comics. The Mandarin starts building towards something big. He does horrific things like unleashing a blob-monster to destroy the SHIELD hellicarier. It's horrific, causing many painful deaths, but at the same time it's just a minor part of Mandarin's plan, a typical monday morning bit of work to get certain chess pieces in position. It seems random, but at the same time there are clues to his big plan left behind.
This goes on, the Mandarin doing things that seem randomly horrific, but actually are part of him setting the chess pieces where he wants them. The heroes get little victories, and little clues, but the seemingly random horrors continue as the Mandarin gets everything in place.
Then he finally has whatever he wanted, which could be mass Extremis virus, or all the parts to complete a giant robo-dragon, or the special jewels to make a series of orbiting satelites to blast the entire world with hate-rays. And he unleashes it, whatever that is, the big thing that all these seemingly random horrors was really just a set-up to.
There was zero, absolutely zero "all of a sudden" about the nanotech. Nor was there anything "aimless" about what he was doing. It was all done in the same semi-mystery style that most Mandarin stories use, where horrific things are done that seem superficially random, but all are actually done towards a goal, and little clues are left to that goal at each horrific event.
But at the same time, I get it: you want to move along the Norn story along, and my job here is to help move the Norn story along. I have altered my post accordingly. What more can I do?