You don't understand the material thats being covered, you don't understand the difference between adapting what will be seven books worth of material, that's heavily detailed and tells a continuous story of a song of ice and fire, and ONE BOOK, whose details are not written in the same narrative style, are written from the perspective of Maesters who are essentially bullet pointing history.

Do you understand that you're lucky you even got these younger characters? That it could have just started, season 1, episode 1, with where we are right now in the show.

The "Histories and Lore" game of thrones animations included on the DVDs I believe and narrated by the cast, tells the story of "A dance of dragons" in twenty minutes.

They're stretching the material out already for you, you're taking it for granted.