Is a Crappie Jig a Fly?

Is a crappie jig a fly?  This idea is might sound a little silly but hear me out.  I recently tied some crappie jigs for a friend of mine and in the process, I thought to myself, "Where is the boundary between jigs and flies?"  Let's look at the facts.

1. Both require a vise.

2. Both involve attaching materials to a hook with thread.

3. Only humans can make flies/jigs when they involve marabou and chenille.

4. A crappie jig is basically a wooly bugger platform without hackle.

I have a feeling that most fly tyers would state that jigs are not flies, and that's fine.  I'm just brainstorming similarities between the two.  Part of me thinks that the lead head is what changes the classification.  Another part makes me think that it isn't a fly is the fact that crappie jigs are fished on light, conventional tackle.  While there are lots of reasons that a crappie jig isn't a fly, it is hard to deny the fact that if you can tie a wooly bugger, you can tie a crappie jig.  The skills are pretty much the same and you don't even need hackle!