The single most energy dense source of power we have that uses the least amount of land including mining and refining compared to everything else, and still preferred method by NASA for powering anything bigger than a camera… is outdated? Yeah okay.
While I agree with most of your statements, the RTGs that NASA uses (assuming that’s what you are referring to) don’t really have much of a connection at all to Nuclear power plants. They are very useful for small scale projects like rovers but really have no commercial uses for anything near people. Plus I think NASA generally prefers solar power whenever they can use it as it’s far cheaper and safer to get into orbit.