It bothered me that there were no Squibs allowed in Hogwarts. Fine, I can get that Squibs would not be able to do any wand magic, and would not be able to fly a broomstick. They still apparently possess enough innate magic to see the school and other magically hidden locations. Out of the classes at Hogwarts that the kids take, a Squib could take and benefit from the following classes: History of Magic, Astronomy, Divination, Care of Magical Creatures, Herbology, MUGGLE STUDIES, Potions (there will be little foolish wand-waving here), Arithmancy, Ancient Runes, and partially theoretical classes on Defense Against the Dark Arts and Charms.
That’s a long list of classes. And some of them are particularly upsetting to me because there’s stuff like History of Magic being left out- that’s their own history they’re being barred from learning. Since Squibs are often forced into the Muggle world, a Squib would make an ideal Muggle Studies teacher and would no doubt be able to teach a more realistic and informative class than someone going off of biased wizarding texts. Squib kids looking into living in the Muggle world would absolutely benefit from learning Muggle studies, especially if they’re from a mainly pureblood family who doesn’t venture out all too often.
And then there’s the rest of them! Arguably you could have a Squib gifted with prescience, and Divination is supposed to be a very accessible branch of magic. Squibs being excellent at taking care of magical plants and animals and making groundbreaking advancements, Squibs working in tandem with each other to breed different magical herbs for potions, Squib potion masters creating all sorts of amazing concoctions. Squibs working with muggleborns and using logic and science to advance magic theoretically, Squibs being huge pro-muggleborn/pro-muggle advocates, Squibs making star charts and Squibs going into the muggle world to use their healing potions in their jobs as nurses and doctors.
Squibs being so completely shut out of magical education was such a sore point for me in the books, especially viewing the treatment of our only prominent Squib- an angry, bitter, glorified janitor often at the mercy of brats with wands. I’m not justifying or endorsing his abusiveness at all, but this was an awful character to use to explore people without magic in a society that bases your worth on it. A lot of time Rowling seems to validate Wizarding prejudices more than she challenges them. While I really enjoy reading the headcanons about Hogwarts being very accessible to people with disabilities, I can’t bring myself to see that as the case with Squibs being treated as they are.