Justice and Rule
Legend
WoTC seems mostly concerned about problematic societal norms, but not about individuals being evil.
I don't remember how Dark Sun worked, but the most future-proof reboot I can think of is to reboot slavery as a pact/bond with the dragon kings.
So basically, everyone has a warlock pact with the dragon kings, except the lowest class get nothing good in return and only bad things from being bonded to their dragon king overlord.
That's... an interesting solution. Also might present an interesting metaphor...