I think that's what distinguishes YA from adult fiction - it's not just the age of the characters, but it's the sense of hope. Because I don't think I've ever read a YA book that feels completely hopeless at the end.
When you're young, you don't have a lot of control over even basic things in your life - where you live, what you eat, where you go during the day, how you get there. You don't have a lot of control, and that can feel sort of unstable in its own way because you don't get a say in those basic things.
College applications are such a huge part of senior year, yet often times you never see characters in books actually do work.
The books you read as a young person are books that stay with you forever. I think that is the biggest privilege of writing for young people. You feel like you can help shape somebody.
When you write something by hand, there's a sort of intimacy that is just intrinsic to that act. You don't get to delete something in the same way, where it's like it was never there.