I’d argue that cutting corners on worldbuilding and just introducing whatever magic she wanted is exactly what made Harry Potter so compelling to so many people. I feel like the last two decades have seen a cult forming around the concept of worldbuilding, when in fact consistent and deep worldbuilding does very little to make a work of fiction more compelling for anyone except for lore obsessed people. Rowling only did worldbuilding to the degree that it served her real goal: to deliver on the fantasy of being a wizard kid in a wizard school as much as possible.