And yeah JK is not a good world builder and there's tons of reasons why.
It starts to be annoying that this is currently being parroted. Rowling may not have many fans in the Codex but the fact is the people who made this game couldn't even keep it up with the fairly straightforward world she made. I watched an hour of gameplay or so to see a bit of what the game was up to, and just from the top of my head:
- In the beginning of the game 2 people are killed. In matter of minutes later the characters who see these people getting killed, which includes the protagonist, acts like nothing happened and that's like everyday occurrence. For those who don't know, the world of Harry Potter is a fairly civilized, people don't get routinely killed and, in the books, not many people die, and every time it happens characters don't take it lightly, precisely because is not common.
- Main character travels to a place and is given like 3 spells without he's making anything. No studying, no nothing, just given these spells. It's a bit too little effort for someone that is just recently joining Hogwarts.
- There are supposed to be certain restrictions on the magic that students can use outside of school. But the protagonist uses them quite deliberately.
- The teacher who accompanies us does not hesitate to put himself and us in danger. While the teachers at Hogwarts used to take a certain amount of paternal care with the students in dangerous situations.
- At a certain point in the beginning, enemies appear, and without first making an overtly hostile move, our protagonist and the professor draw their wands with the intention of attacking, jumping in a dangerous situation again very quickly. But when these same enemies then show every intention of harming a neutral bystander, the characters do nothing to prevent it.
- Again, little mention of a person being harmed by events. With that would be three people injured or killed just at the beginning.
- One of the sensations that stick with me the most when reading the books or watching the films is the first time the Hogwarts dining room appears. Ever since I was a child, that room has been etched in my mind, both for the food and for how alive it felt (it helps that I'm a hobo who barely eats, so the fact that there was so much food left me dazed). But here you walk into the Hogwarts dining room and... it just doesn't feel as lively.
About the conversation regarding Purebloods and Muggles. Bloodlines DO have some effect on the type of magic characters use. With one or more wizard parents, their offspring will have magical abilities. Whereas when the parents are Muggles, it is very uncertain or unlikely that the children will acquire magical abilities. This also states that wizarding bloodlines take precedence over non-magical bloodlines, so it only takes one wizarding parent for a child to acquire them.
Very simple but quite concrete details which the book respects. Which I think Rowling deserves merit for.