The dinky motor leads or where they attach to the motor will pull loose long before a good butt splice connector. I have seen it many times. Hate to be old and be telling old war stories, and to be old enough to think anybody cares. Lol! But....
Many years ago I worked on deep salt water wells. Up to 75HP submersible pumps were set at about 800' on 4.5" fiberglass pipe. We used round jacketed 2-3 wire and clamped to the 30' pipes above each coupling with a special saddle and a SS clamp using an air operated little machine. I could make a splice in a New York minute, even in blowing snow, using heavy butt splice connectors and 130C rubber tape.
The fiberglass threads would wear, come loose, and I would be fishing for a 75HP pump with maybe 400' of pipe screwed to it. Nearly every time the pump would be hanging by the wire at the well head. Recognizing this before taking anything loose was important. I pulled many of these by the wires. We also learned quickly to have an elevator or plate under the coupling before cutting one of those SS bands. Cutting the band when it came up first could result in watching the pipe coupling fall through the well head and the heavy #2 wire would start whipping from the big circle we made on the ground and dragging anything in the vicinity down the well with it. Best to back away quickly and just let it happen.
However, being somewhat buoyant and falling through 400' of water it wasn't dropping at terminal velocity, but still pretty fast. Stupidly, once I grabbed the wire with my gloved hands, bent it over the well head, and with gloves smoking stopped the pump from falling. Once the weight was being held by the wire, we would tie knots in it and connect a hook from one of two cables hanging from the hoist. We would pull the wire up 40' (height of mast), tie another knot, connect another hook and cable, and pull another 40'. As soon as a pipe coupling came above the well head we would throw a plate or elevator under it. After cleaning up the mess we would resume pulling the pump by the pipe. We were also usually working in a 40 MPH dirt storm or cold north plains wind and a chill factor of zero. Life was never boring in those days. Lol!