It doesn't need to be a good mechanical connection, it needs to be a good ELECTRICAL connection; there's a difference. You're flowing electrons, not water (although there were some idiotic water-filled cables on the market a few years back, maybe they need to be spade-terminated!). A large percentage of removable electrical connections are made with spring pressure, not screws. And the big advantage of spring-pressure contacts (including WBT bananas and the Neutrik Speakon connectors) is that they maintain consistent high contact pressure over time, and don't loosen due to thermal cycling, which is exactly what's needed for a good, reliable electrical connection. It's better than a thumb-tightened spade, and not any better or worse than a wrench-tightened spade, just different.
