Breadboards hide the connections and require a significant amount of thinking in transforming to and from a circuit diagram. This isn't hard once you've mastered it, but I can understand wanting to ease K-12 classrooms into it.
Yeah. Connections on heavily-used breadboards can also become very iffy, which is somewhat demoralising: you assemble a circuit on the breadboard and it just flat out doesn't work, or perhaps it works for a bit then dies.
While it seems to be a bit of a dead technology now, something like wirewrap would be a much better way to translate directly from diagram to board.
