Not a mathematician. The issue I see with a handed-over proof is tunnel-vision: you explore only the understanding of the proof. Without a proof, your explora

Not a mathematician. The issue I see with a handed-over proof is tunnel-vision: you explore only the understanding of the proof. Without a proof, your exploration branches out much further, in directions that could seem fruitless, but may uncover new understandings that are now "hidden" because the handed-over proof drastically lowered the incentives to find them.