Small correction: The potion Lupin takes in every month isn't preventing him from turning but keeps him conscious during him being a werewolf. He still gets the pain that comes with the turning, he's still "sick" every month.

The fact that JKR insisted on giving the racist incel who bullied his students a redemption arc but not the grumpy disabled janitor is very telling.

The way Ron's dad treats muggles and their culture as a research project reminds me of colonial anthropologists studying indigenous cultures

Ron immediately defaulting to his kid defiantly marrying Draco's kid as the end game when they are children who haven't even MET yet is certainly... a choice of events to add to the ending.

That grapefruit scene... Dudley is what, 16 or 17 at that point? A quarter of a grapefruit is basically nothing to a teenage boy. The fact that he's depicted as greedy for eating when he's practically starving...

It's always been weird to me that stuff like Love Potions and Sleep Charms aren't unforgivable curses that would get one expelled, but you do magic once outside of school and you're kicked out for defending yourself? Malfoy's friends were still ruffied by Hermione, Ron and Harry and Ron was still assaulted by a women looking to force her love on him with a potion.

Me as a child: Wow I love Luna I don't understand why nobody likes her.

Dam that Luna section hit me really hard. I didn't realize how socially rejected I've been feeling till you described how her "friends" treat her and realized that's what I've been feeling.

Honestly I still think the clearest parallel between the wizarding world and the muggle world is a class one. The wizards are the upper class-- but magic. That's why they refuse to clean their own castle, even though they easily could. It would be beneath them. And in that light, the wizards' anxiety that they, this tiny minority of powerful people, could be done away with if the large group of less powerful people ever turned against them en masse strikes me as an unusually coherent bit of worldbuilding on Joanne's part.

I never put this kind of thought into the Harry Potter books. All this went right over my head, but I was always bothered by how nothing changed in the wizarding world. They had this huge, brutal war and then went on with the exact same system.

I have a small note about the fatphobia, as a person who grew with a "weight problem" in the 90's. The attitude depicted in the books is pretty much the attitude that surrounded you, if you were considered to "struggle" with your weight. I grew up believing I was fat, and always had to "watch my weight" while my brother got to eat everything he wanted. And the real kicker is that when you see pictures of me from I was a child, I only got slightly overweigth when I inevitably developed a full-blown eating disorder.