I think mixing of socially constructed races and genetic ethnicities is a recipe for disaster. The only thing the latter is good for IMO is to highlight how the former is a social construct.
With that in mind, tying cultural heritage to "where did my close ancestors come from" seems like a more sensible approach than genetic percentages, since that actually connects to a social context.
Having said that, cherry picking one out of thirty-two great-great-great-grandparents over the thirty-one others sounds pretty absurd. But I'm not from North America so I probably miss some social context to understand the logic behind that.
With that in mind, tying cultural heritage to "where did my close ancestors come from" seems like a more sensible approach than genetic percentages, since that actually connects to a social context.
Having said that, cherry picking one out of thirty-two great-great-great-grandparents over the thirty-one others sounds pretty absurd. But I'm not from North America so I probably miss some social context to understand the logic behind that.