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>If the poor lived in mansions and drove Ferraris, but the rich owned entire islands and private rocket ships that travel to Mars, the poor people still wouldn't have access to what the wealthier people have, still setting them back from achieving their true potential.

It's not about absolute material equity, it's about comfortably meeting one's needs such that second order concerns (like studying or tinkering with a mobile SDK) become viable pursuits. Living in a mansion means you can likely afford food, rent, transportation, insurance, healthcare, tuition, and all the other expenses that leave the poor with little room for "achieving true potential".