Really interesting concept you brought up, did not know that law and yes it makes perfect sense.

And I totally get your point, but it is still an issue to me considering that she wanted to keep the audience hooked as they aged. As someone put it in another comment, in the first book, Harry is eleven, it appeals to kids ~11 y.o, and so on. But, and I speak personnaly, by the fifth book it was already too disjointed for 15 y.o. me. Her books are like a Jojo’s Bizarre Adventure book/episode, but without all the corny humor and the self-awarness that makes it fun.