Repeating the same noun with という between the two emphasizes that every relevant member of the group is included, with no exceptions. The group is normally limited by the surrounding context.
How the scope works
The pattern does not usually mean every such thing in the world. Context supplies a limited set: the shops in a town, the windows in a building, or the reporters at an event. Repeating the noun then sweeps across that entire set.
Covering the whole group
Notice how each sentence identifies a contextual group and then makes a broad statement that applies throughout it.
廃屋の壁という壁に落書きが残っていた。
Every wall of the abandoned house had graffiti left on it.
何から何まで means “everything from beginning to end” or “every detail,” whereas the repeated-noun pattern exhaustively covers one specifically named category.
