I mean I would say Game of Thrones is better than, say, Percy Jackson & the Olympians. More mature = more conflict for the protagonist to overcome = more sweeter victory. Also, you're allowed to have more realistic villains and trials for your characters, and often times realism enhances the struggle for the progatonists.
But of course, this is a personal preference. Sometimes you can have a great story without getting too mature. Harry Potter for example (although there are certainly some dark themes there). But I really love the show The Magicians, which is kind of a grown up version of Harry Potter. All personal preference, again. But these are some of the reasons someone might want a more mature story.
EDIT: if you're pretty young I would not recommend reading my story. It's not really kid friendly and has some distressing stuff in it. In fact, I'm pretty sure all my stuff does. Except the dragon-dick joke story, but that's obviously not appropriate for a kid either.
did you know you can edit your previous post if no one's responded to it
Did the Magicians get better after awhile? I watched a few episodes back in '22, but I sorta got the sense the writers didn't have a clear idea as to where things were going. Maybe I was wrong though if you're comparing it to Harry Potter, which I'd say is pretty cohesive.
Is that the show where some dude got repeatedly raped by a pedo author so he's trying to destroy the world and only a group of young magicians that apparently all have sex with each other at some point can stop him?
Oh and some other girls get raped by a trickster god or something.
Yeah it didn't get better.
One weird thing they did though is they brought the pedo back and he kept trying to help sometimes with the various shit going down and nobody ever wanted his help just saying "Ew no, you're a pedo."
And he'd get pissy and storm off. Lol.
I feel like though they were setting him up to be the next major threat if there had been another season. Since there was some mention towards the end that the realm or whatever got taken over by some hostile force (again) and I had a feeling it was going to end up being the pedo author.