It's the little things that make it feel a world. Without those details, it feels artificial. Like, why hasn't Sam's dad found him? It'd not show ruining but it also doesn't make sense.
Stan the Man took everyone with him, and all the supplies. He wasn't coming back. As for squatters, common folk aren't going to go claim Dragonstone. There's nothing to eat.
Lannisters, Tyrells, and Dornish were all too preoccupied with murdering each other to try to man an island castle.
Like this isn't a giant leap in logic that the castle is abandoned.
Sam's dad will come for him but I mean come on they can only fit so many things into one episode. And Sam has only been there for one episode!