You can't fully extract yourself from your cultural environment, exceptional philosophers like him already managed to do that a lot more than commoners but he missed other things, it's to be expected. Reminds me of the people who wrote the first Men's Rights Rights of Man and of the Citizen during the French revolution which was incredible progress and yet they voluntarily ignored women, despite women fighting to be mentioned (like her https://en.m.wikipedia.org/wiki/Olympe_de_Gouges).