Quoted from Eddie:You ask what about the coil wires you still need to solder them so where do you save time with a clip on assembly?
I talked to a JJP staff member about this during a factory tour. He said they started out using clips for easy swaps, but found that they would shake loose sooner or later, making things unreliable. Also, clips cost slightly more than just soldering the wires. So, because of those two reasons, they ended up abandoning clips and just going with soldering.