Okay, mea culpa on that one. Still, there many people and things in the previous stories that the epilogue simply ignored for no clear reason.
True, we don’t get the wrapup for all of the characters. But we do for the main ones we lived with for seven books. Harry, Ron and Hermione, with Neville and Ginny thrown in.
Upthread it talks about an encyclopedia that Rowling is working on. It’s supposed to give much of the backstory.
Wrapping up all the loose ends would have added another 100 pages or more.