Well, for one, AGI is just likely to supercharge the economy and result in massive, albeit manageable (assuming democratic institutions survive) societal change. ASI is another thing altogether, in which case widespread death becomes orders of magnitude more likely.
I think it is fair to say leaving the city can be an attempt at fighting to bring the child out into the sunlight.
Yes, and also the probability that we do not tire of it, and that there are people in a worse position than those in a utopia.