Aside from the novelty of the newness, it won't matter for artists unless it's a less expensive alternative, because visually, there's nothing there that you can't get cheaper.
According to the OP:
> Blue pigments, which date back 6,000 years, have been traditionally toxic and prone to fading. That’s no longer the case with YInMn, which reflects heat and absorbs UV radiation, making it cooler and more durable than pigments like cobalt blue.
> “The fact that this pigment was synthesized at such high temperatures signaled that this new compound was extremely stable, a property long sought in a blue pigment,” Subramanian said in a study about the compound.
I'm sure many artists aren't creating for wholly hedonistic reasons, and instead want to create things that will endure.
What these surfaces have in common is that they're dimensionally stable: they don't change in size depending on temperature or humidity, and they're chemically impervious to the ground layer. Oil paints can degrade linen canvas over time as the oil seeps into the fibers and oxidizes.
After your dead, no one comes back for you. Instead, your most visible legacy in this world slowly falls apart, changing color, getting brittle, and looking decrepit before it falls apart. Artists aren't invulnerable to vanity.
It's possible that YinMn is similarly lightfast, but the historical blues remain cheaper and more than lightfast enough for virtually any artist concerned with longevity.