Completely disagree. And if you read the instructions on aftermarket ecu wiring, they all recommend terminating the wire at the connector and a proper crimp.
Here’s one example, View attachment 1716086586
Also, I seem to remember reading something regarding the chemical makeup of the solder reacting with the stranded wire and corroding. Maybe the acid in the solder? I've taken apart may soldered connections that were green with corrosion.