For those interested in real world wiring standards:
European electrical designers have been far ahead of us for years. They have all but universally moved to DIN rail components and use ferrules on wire ends to get away from the problems that go along with trying to capture a wire or wires (tinned or not) under a screw.
The solder dipped wire ends you see on some equipment are intended for the US market where all manner of cheap and less reliable termination methods are the norm. Dipping the wire ends at least gives a chance of obtaining a secure connection without stray ends shorting out with their neighbors on an open connector block or stabbing the installer.
I manufacture a marine exhaust treatment device controller and use nothing but DIN rail devices with ferrules on every wire from millivolt level signal wiring to 400V power. The only ring terminal used is to connect a safety ground to the cabinet.