Mod The Sims user, has proved that creating default skin replacement mods is possible in The Sims 4. For testing purposes, I made a default replacement of the blue skin tone in the game, changing the blue for a purple color. It shows that default replacement mods can be made for things like skin.
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Aug 15, 2014 - The Sims 4's Create-A-Sim demo is now freely available to. For far more robust clothing options, hair styles, nuanced skin tones, and so on. Mod The Sims Online: 1332 News. (to change your download drilldown view). Handpainted over Maxis' textures, these skins are a detailed revision of what Maxis.
Hopefully replacements could be made to fix issues with some of the darker skin tones lacking warmth and some of the eye colors being too similar (there are two greens and two blues that are almost identical to each other). Obviously this isn’t the same as adding new skin tones or eye or hair colors, but it’s a start.