You can use whatever floats your boat and that includes pins and spades. IMO, using connectors is a neater and more elegant, if you will, way of joining two pieces of equipment and avoids the possibility that a stray wire causing a short. BTW, not all gold connectors are actually gold and the thickness of the coating does vary. What gold does is provide a surface that is not attacked by chemicals which includes oxygen. Don't overly obsess over the minutiae.
"I've found that when you want to know the truth about someone that someone is probably the last person you should ask." - Gregory House