I am an old man so I don't read much kid's/YA fiction and I wasn't ever a huge HP fan. I tried to watch a tv adaption of WW with my daughter and we didn't get past the first episode for some reason. We do like a lot of other witchy fiction though. I am hoping the Witchhat Atelier anime is high quality and doesn't have creepy fan service. That had a really interesting magic system.
JKs works are full of tropes as is most fiction and it clearly isn't great literature but I am not persuaded by accusations of plagiarism. Every Tarantino movie rips off other movies. The Dollars trilogy was clearly a retelling of Kurosawa samurai movies.
I don't want to praise JK given her open hostility to the community here but the cross over appeal of her works was a cultural phenomenal at the time. I understand why many people are motivated to rip her work and legacy to shreds. She has very much earned peoples disrespect. As someone who is not targeted by her hateful views I feel detached enough to reject JK as a person without completely dismissing her works and cultural impact. Yeah, that's some privilege at work but we are who we are. I am never going to have the same awareness or sensitivity about lack of representation, stereotypes etc in her writing.
I tried to read Twilight on a dare once. I dare anyone to suggest JK's writing is worse than Stephenie Meyer. A lot of popular fantasy and YA isn't much better than fan fiction. Hunger Games feels even more derivative in many ways but I don't know if that hurts it.
I agree HP isn't great art. I read the books once when they came out and that was enough for me. It was a genuine cultural phenomenon though. In the late 90s. early 2000s, before iPhone, Facebook, Youtube it was just some pop culture that filled in the many hours of analog leisure time. It brought joy to a lot of people and relieved some boredom for others. The series had good and bad. The good was the accessibility and interest it generated in reading for a relatively wide audience. Given JK's current reputation as a person I think it is too easy to dwell on the bad and completely ignore the rest. It is reasonable to cease supporting the HP franchise though. Whatever its merits it had run its course a long time ago.