Why ruin a strong, emotional character moment with a hint to a dumb mcguffin chase three films down the road?
If anything, why not just recolor the Mustafar scenes in 9 and just make it a totally different planet, unrelated to Vader? It would definitely be easier to just regrade those scenes and make it Corvus, or some other random planet. I’m surprised you weren’t going to make this suggestion, since you’re more enthusiastic about recoloring different planets.
Yeah, JJ’s idea of it being Mustafar is very odd since it has zero relevance, thematically or plotline wise.
May as well make it a new video game quest planet for Kylo.