Not every proposed change is a new feature. I suggest that on meta, we also allow the tag change-request as one of the required tags when someone proposes a change to an already existing feature.
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The difference in the two is insignificant enough in context of posting something here on meta that I don't think there's a need for both tags.
If the tag was "new-feature" I would agree, but the current tag is "feature-request". That could be assumed to mean either a new feature or a change to a current feature.