Also, it always felt like kind of a cheat that the Wayfinder wasn’t destroyed with Ren’s ship, which this fixes.
To be fair, it was found on Mustafar, and originally belonged to Vader. That thing needed to be extremely heat-resistant by design.
Actually Mustafar has many non-volcanic areas; suggesting that everything needs to be heat-resistant is kind of a hurtful stereotype peddled by Calamarians and other people who don’t understand Mustafarian culture.