Skin tones for emojis shouldn't be a thing at all.

There is something weirdly dystopian about a consortium and ultimately mega corporations deciding what aspects of you are important to distinguish yourself from others, what options for those should be available or what concepts you may use to express yourself. But this is also a wider problem with emojis beyond just skin tones - the selection of foods for example is best described as what a California hipster would think of and hardly representative of what someone around the world would want to communicate.

And then there is now the problem that instead of defining building blocks for communicating concepts, Unicode now feels the need to enumerate all concepts individually. This is not just extremely limiting in what you can communicate but also horribly inefficient where with each new version fully compliant implementations need to add thousands of additional glyphs.