I think that an AI, a "generalized" intelligence with a generalized understanding, capable of performing every intellectual task, and adapting to new intellectual tasks, that a human being can do is certainly far away.
>2) Do you believe that cognitive superiority is not a threat in general, or specifically when not embodied?
Personally, I believe that "cognitive superiority" in a general sense is not what makes a real threat on an individual or on a global scale in either case. When that is achieved, so to speak. We already have so-called cognitive superiority in specialized tasks in many cases. It sure as shit is not generalized, and it still can kill you on an individual level when you put it into a car or strap a gun to it. But it can't adapt, and it can't generalize.
Is there a global risk right now? No. The global catastrophic risk comes from human beings. Will there be a global catastrophic risk from a superior intelligence in the future? Mostly the scenarios are "the lights come on and AI does machiavellian shit and copies itself to everyone's smart phones and launches the nukes and mails anthrax to everybody. QED." so I doubt it.
3) Do you think we can trivially and indefinitely keep AI systems under control/"aligned"?
We can't even keep our infrastructure safe from the next solar flare. Personally, I think we have bigger fish to fry. Speaking frankly for unembodied: you just pull the plug. Just walk away from the screen and close your eyes. For embodied intelligence, I don't think there's actually X-risk or whatever. Hardware is expensive.
As far as an extinction risk, no. I don't personally believe that. It's overblown. We have better ways to destroy ourselves, and there are much more likelier ways that we'll be destroyed without invoking some intelligence of our own creation that subjugates and destroys us.