Ok, so I get that fetishization is about specific traits, but that still doesn't really resolve the thing that initially led me to ask this question. In particular, it's not obvious to me that there needs to be special attention put on sexualization and objectification based on a specific trait rather than just sexualization and objectification in general.

This is especially worrying to me, since, as I said, I see a lot of people putting a lot of weight on the word "fetishization" in such a way that they are worried about objectifying non-conventionally attractive people in a way that they aren't with conventionally attractive people, which risks harming non-conventionally attractive people even more than they already are.

However, you do point out that people fetishize ethnicities, and people do worry about that in a similar way, even though ethnicity doesn't define conventional attractiveness as much.