One clever trope that Urasawa introduces, which I think is genuinely an original one – not just with respect to the Tezuka original but with respect to the whole genre of robot fiction – is that in this world there are celebrity robots, like Mont Blanc. The humans revere them. And yet the humans continue to treat the mass of ordinary robots as disposable non-persons, despite the fact that it’s not so clear what would separate your old-model cleaning lady robot from noble Mont Blanc. Is it just that the cleaning lady doesn’t write poetry? I think this is good allegory of typical ethnic conflict patterns. The dominant group somewhat assuages its guilt/uncertainty, by raising just a few members of the minority above even the level of the majority, imbuing them with extra authenticity and heroism, and somehow in this way actually cementing the old majority/minority relations in place, rather than challenging them.