Why has this gone any further than a black lightsaber is a complete contradiction and totally unfeasible?
This below.
It's a color, does it really matter that much unless it's somehow uber powerful? It's just a color, let people have it if they want too, as there is a black crystal you can use in TFU and we already bend some canon, not like allowing black sabers will open a worm hole and the crew from Star Trek will arrive.
Thats my Oppinion anyways.