Called it!
Pretty soon, with some practice you’ll be wondering why you didn’t solder more stuff before.
Tip: Heat shrink tubing over the connectors keeps stuff from corroding and provides some strain relief.
I’m a big believer in soldering for electrical connections, because it’s secure and corrosion proof. That said, there are times when crimping is a better answer. Connectors in cars are crimped partly as a cost saving measure, and partly because the car is a hostile environment with lots of vibration and temperature extremes. Soldered wires subject to vibration and thermal expansion/contraction can break at the edge of the solder because it’s too rigid, where a crimped connector can allow a tiny amount of motion. This shouldn’t be a problem for the CNC, unless you are allowing the wires to move too close to the plug. Proper strain relief is necessary.
With that caveat, a good solder joint is a sure thing. I’m glad that your experience turned out well! Better tools = better outcomes.