They aren't going to move. Potted in pu sealant in a tube.The soldered joints will be fracture points due to vibration, better to use an uninsulated butt connector and heatshrink over.
When we used to manufacture industrial joysticks the only way we could prevent wire fracture was to use bare copper braided wire wrapped around a rivet before setting them. Never had a failure. Soldered or crimped wouldn't last long.