Those 2 arguments aren't the same thing.
True, but the sentiment is similar. People view teenagers as adults with the capacity to function like an adult regarding a ton of stuff. The problem with that is highschool in the United States is such a babyish and non helpful tool for making kids function and survive like adults. Highschool is great for socialization and such, sure, but it there aren't many skills or realities to be learned.
The best classes at my highschool revolved around wood working, shop, stuff you had to do with your hands, and the teacher was a semi functioning alcoholic who smelled like mouthwash/liquor and would use dangerous tools and machines looking like his eyes were closed. The programming class I took had was taught by an incompetent sports club dude who decided we needed to learn JAVA and then use some stupid ass software that doesn't exist anymore.
You need to get a signed pass to use the bathroom, even when you're 17 and 18, that's some really babyish shit. And yet, you can sign up for the military right after having to get permission to shit and piss.
Point is that kids aren't necessarily coddled, its that they aren't given responsibilities and tools any human being at any age can use.