Technologies I take for granted now but remember thinking were exciting and cool when they came out
I'm sure there are a bunch more I'm missing, please comment and add some!
Some of my own:
Oh yeah, cheap shipping! I grew up in a military family, all around the world, and I remember thinking it was so cool that my parents could go on "ebay" and order things and then they would be shipped to us! And then now look where we are -- groceries delivered in ten minutes! Almost everything I buy, I buy online!
Searching for equilibria can be infohazardous. You might not like the one you find first, but you might end up sticking with it (or worse, deviating from it and being punished). This is because which equilbrium gets played by other people depends (causally or, in some cases, acausally) not just on what equilibrium you play but even on which equilibria you think about. For reasons having to do with schelling points. A strategy that sometimes works to avoid these hazards is to impose constraints on which equilibria you think about, or at any rate to perform a search through equilibria-space that is guided in some manner so as to be unlikely to find equilibria you won't like. For example, here is one such strategy: Start with a proposal that is great for you and would make you very happy. Then, think of the ways in which this proposal is unlikely to be accepted by other people, and modify it slightly to make it more acceptable to them while keeping it pretty good for you. Repeat until you get something they'll probably accept.
I think it is useful to distinguish between two dimensions of competitiveness: Resource-competitiveness and date-competitiveness. We can imagine a world in which AI safety is date-competitive with unsafe AI systems but not resource-competitive, i.e. the insights and techniques that allow us to build unsafe AI systems also allow us to build equally powerful safe AI systems, but it costs a lot more. We can imagine a world in which AI safety is resource-competitive but not date-competitive, i.e. for a few months it is possible to make unsafe powerful AI systems but no one knows how to make a safe version, and then finally people figure out how to make a similarly-powerful safe version and moreover it costs about the same.