It may not be based on what the mesh's creator considered repetition, but repetition is encoded within the mesh. Not sure if the mesh builder discovers some of the repetition itself.
Look at a terrain example:
Look at a terrain example:
In general, I wouldn't think of Nanite as "one thing". It's a combination of many, many different techniques that add up into some really good technology.
If your triangles are at or below the size of a texel, texture values could even be looked up offline and stored in the vertex attributes directly rather than keeping the UV coordinates around, but that may not be a win.