It can be complicated to draw a line between cultural elements worth preserving and crazy religious fantasy that needs to go. Indian caste system, IIUC, is deeply intertwined with their identity and ethics that it cannot be just cut out and removed. It is also partly coming from practical needs just like food related taboos of Middle Eastern religions that would need to be explained for its removal to be justified following the Chesterton's Fence principle.

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absolute OT trivia that I needed a place to drop: the Indian karma system do not consider beings outside of animal kingdom, e.g. a roadside tree, to be alive and directly involved in the karma and reincarnation and all that, and apparently so did not the original Indian Buddhism. It was originally Chinese, and more prominently Japanese, exposition and localization of Buddhism that changed it up to be the current Studio Ghibli form of it that yes mountains and rivers and 100 year old Italian combat biplanes can all be alive and sentient and that you just ate a carrot is a sort of your original sin and even strictest of vegetarianism is not guilt-free. Your LLM can elaborate on this if necessary...