There's another practical niche - museums. The Museum of the Liberation of Paris - General Leclerc - Jean Moulin (same museum, they couldn't decide on the name

There's another practical niche - museums. The Museum of the Liberation of Paris - General Leclerc - Jean Moulin (same museum, they couldn't decide on the name apparently) uses HoloLenses in the underground bunker that served as a command post during the uprising in Paris that led to it's liberation. It allows for a much more immersive experience than just signs and mannequins (they have both of those too). I can also see that working very well in e.g. natural history museums, with AR making fossils come to life.