I think a lot of ponderment around class structure, especially from anyone from western society, comes from the fact that we are trained to pretend class doesn't exist. It's just you don't see it unless you're from the bottom/outside. Growing up, even though the public education system said i could be anything, the councilors always told me I was from bad stock and needed to just ride my years out until I was 18 and that I would never be anything but a garbage man, a cook, or a janitor. College was beyond my means, so why should I try? Being poor and/or homeless in america is no different than being in the poorest class or undesirable class in India. You line up the definitions, and they are still the same, just unnamed in "civilized" society homeless then poor then tradesmen then medical and clergy then lawyers and then finally politicians. Class system is inescapable, but since we're taught to pretend it's not there and not real. So when we come across it in stories, it pulls at us. We see it daily, so it resonates with no explanation.