Are fresh blueberries really better than frozen blueberries?

A recipe I have has a review that states that frozen blueberries in a blueberry muffin are absolute garbage and only fresh ones will give you that desired taste. I have also seen this answer that notes that frozen blueberries that are thawed will give a better taste and composition in a blueberry muffin.

My wife insists that fresh blueberries are the only real way to make blueberry muffins, and that frozen blueberries are usually rotten, and aren't as real (she cites the fact that when baked, frozen thawed blueberries come out blue, but fresh ones come out purple.

Is there any real life merit to her claims?