Harry Potter: Wizards Unite is live — but will it spell joy for children?

It feels like a long time since the announcement of Harry Potter: Wizards Unite, an official game set in J.K. Rowling’s wizarding world, made by the team behind Pokémon Go. Mainly because it is a long time: that original announcement was made 19 months ago in November 2017. It was an enticing prospect: another mobile augmented-reality game that would get Potter…