This is what happens when your worldbuilding is done by someone with no head for systems analysis. Political systems and magic systems use the same skills to understand.

That's why I hate apolitical stories. The writers are usually bad at worldbuilding too.

My mom taught high school English for decades and she used to tell her students that JK Rowling is a great storyteller, but a terrible author. She dreamed up a really cool world that really resonated with people, but her execution in that world is awful. The biggest place you see this is to lift the curtain on anything, and it crumbles instantly. Time Turners? Unnecessary plot device with massive implications. American wand? Kills Voldemort immediately. Sex ed at Hogwarts? No sex, only snog?

JK Rowling hasn't helped herself with this either, by continuously editorializing. Hermione was always black. Dumbledore is gay for wizard Hitler. Wizards didn't need bathrooms and would just magic away their shit, except wizard bathrooms are a central plot point for the second book. When she was starting out, she didn't have the money for a real editor. When she made it big, it was by the strength of her own bootstraps, so she didn't need one. It shows. She shat gold once, and in her eyes, it's now gold every time.

Avada Kedavra is dumb. Wizard duels essentially have to follow the be first, best, or cheat rule. The definite death spell makes being best pointless and cheating too slow. You have to go nuclear first and fastest. Also, the defining characteristic is the green flash and no marks on the dead body. In the world of Harry Potter, if nobody sees the flash, and nobody finds the murder wand, every heart attach and brain aneurysm is indistinguishable from the universes ultimate crime.

But, I think things like this are a reason why people love Harry Potter. It's why I did. When you're presented with a world so incredible with an execution that's lukewarm at best, it allows your imagination to take over. I love reading cheap, bad, free-on-Kindle sci-fi and fantasy, because oftentimes the central idea can be really unique, cool, and interesting. The execution can be awful, or sometimes not, but the core idea is usually a diamond. I get to be an archeologist, uncover it, and re-imagine it as I see fit. That's why so many Harry Potter fans get defensive. It resonated so strongly because people had to invest their own imaginations so deeply to make sense of a story that fundamentally doesn't hold up to scrutiny.

Same sort of problem with Quidditch. Whichever team gets the golden snitch automatically wins, so the whole game would realistically just be everyone trying to get it and ignoring everything else. JK is very bad at designing world rules. Maybe that's why she's so bad at comprehending reality as well.

Not using Avada Kadavra in a wizard duel in which you intend to kill the other is like having a duel with guns with infinite ammunition and attempting to bludgeon the enemy with the stock or stab them with a bayonet instead without ever taking a shot.

There is a reason that every real fight Harry was in was just Avada Kadavra vs Expelliarmus. If you can just kill with an unbeatable curse and are willing to, you just kill. If you aren't willing to kill, your best recourse is removing their weapon before they kill you. It may be boring, but literally any other moves in a typical duel would be the sub-optimal at minimum, suicidal at worst.

It was more like HP using expelliarmus a billion times

I thought like, canonically, avada kedavra fucks up your soul or whatever everytime you use it and it slowly corrupts you or something

So it has a downside.

Also, to work, you have to be able to mean it and basically be a psychopath for it to even work right.

Isn't there explanations for why people dont just use it willy nilly?

Joanne Rowling, folks.

Don't use her preferred name when she's an utter cunt destroying that right for others.

She did write/say that there was no defense versus the killing curse did she not? (Except being Harry P that is)

My first time hearing this in the movie I was like "did this mfer just say abrakedabra‽"

Why did they just both insta-die? Shouldn't the green energy shit have collided and made a nice spectacle like they did in the movie? 🤔

That's why Dumbledore kicked Voldemorts ass by flinging a statue infront of him, them doing a bunch of fancy shit, encasing him in ice. Since it's easier to hit than with an Avra Kedavra. Not that it matters until the author is no longer alive...