The wealth thing isn’t necessarily true. And the banebloods having superior rights and privileges is not the same thing as “Tierran society is like Armaggedon*, with cooler fashions.”
As far as setting the bar very low, it was in regards to you saying “a society where the Banebloods hold all the power and the Baneless get spat on.” - which is a more accurate description of Antari society. Giving some rights, privileges, and opportunities to the baneless is a fundamental part of Tierran society - for example, banebloods taking up a trade being taxed severely compared to the baneless.
Is that enough to make it Just? No, but it’s certainly not “being a baneless commoner is synonymous with knowing only hunger and constant active oppression” either.
*the Warhammer 40,000 planet.