No, but what does give Archaeologists nightmares is the understanding that
we aren't aware of the uses of the materials in our environment and thus we miss the potential that our ancestors were. So, when we interpret the sites and artefacts, etc., we might be getting it wrong because we just don't know enough.
That's why an entire site isn't excavated; when at all possible we leave as much as possible for future archaeological investigation, potentially with better techniques and more research.
You note that, "The researchers can’t rule out other possible Neandertal uses for manganese dioxide, including body decoration. But based on their experiments, they suggest adding fire-starting to the list."
Hedging their bets a bit there
It's like the old 'ritual significance'….we're sure they were using it for something, but not quite certain just what…..yet.
M