If you think about it, if you really clear your mind of the culture and norms you take for granted and take an outsider view, it's actually kinda creepy to have a shelf full of exclusively white Nutcrackers (or Santas, or elves, or whatever).
In a society where people have diverse skin colors, I mean. If you're in Eastern European village Nowheresebirsk where literally everyone is white, okay yeah, fine, a line-up of all-white Nutcrackers shouldn't be disturbing.
But in a society where you see a black/brown/whatever person every time you step outside? where literally as you're looking at the shelf there's people of other skin colors in the store at that moment? Kinda fucky.
Because The Nutcracker isn't really a distinct character anymore. It's not one Specific Guy where racial features are part of depicting that Specific Guy.
Like... if you had a big shelf of action figures of one specific version of a popular character, okay yeah cool, it's not disturbing that they're all one specific skin color, eye color, hair color, nose shape, and so on. But the more generic you go, the more sus it becomes. If you were in a random US town, picked a random store, and then you noticed every single toy only had blonde hair, blue eyes, white skin, and so on... that hits different.
Now, if you came from a world where racism by skin color is as much a thing of the past as the old racisms different white peoples had for each other, and you noticed that every. single. Nutcracker. is white, you might think in good faith "oh, this one Specific Guy must be popular in this culture".
But we're not in that world, and The Nutcracker is far enough along the transition from Specific Guy From That One Story to being just a generic icon of winter holiday vibe. He's no longer A Guy - he's A Type Of Guy. And when a type of guy is race-specific, that's significant.
So when I try to imagine what it would be like if I was, say, a small black boy growing up in the US... the moment I realized all Nutcrackers are white? especially if I saw a bunch of different ones all on display at once? yeah that also hits different.