You are confidently incorrect, and defending your errors with all you have, which is nothing.
We're talking electronics and electronic circuits. Car stereo systems.
Wires are used in electronics, and in electronic circuits.
Those wires are not bridged, they are connected. They are spliced. They are touching each other directly. There is no "bridge "between them.The solder is not a "bridge". It could be silicone, it could be heat shrink tubing. It could be JB Weld or cyano.
In high voltage circuits, soldering would not even be code. They should be twisted together and wire-nuts put on them.
Go back to school. Learn the basics before you attempt more complex things.
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