It's actually the opposite. The books mentions some events and characters in one line. They've actually beefed it up and added more shyt here. People complaining about pacing don't realize how fast the book(s) fly in this era.
The showrunners knew this when they took the project on, so I can’t accept this as an excuse for poor storytelling. They knew they were going to have to flesh a lot of this stuff out. I’m not even bothered by the time jumps, but stuff like Strong house mutiny is egregious. I don’t even remember seeing Cripplefinger, his brother, and his father converse. Was he consistently and chronically disrespected? Or is he just a power crazed maniac? We only have our guesses to his motivation. Does anyone even know Cripplefinger’s position in King’s Landing?
I realize how difficult it is to fill in gaps in a story as well fleshed out as ASOIAF. They added very little to GOT early seasons and still inadvertently invalidated Cersei’s prophecy with a 30 second conversation they chose to add. Plus, they have to add to multiple storylines to balance screen times all while keeping the story compelling or risk the audience calling it boring. But, again, this is what they signed up for. And House Of The Dragon has the advantage of being “history” to GOT. So minor misalignment from things we’ve seen/heard in GOT can just be dismissed as the accepted history being inaccurate, which is true of historical stories in our world as well.
Some of their other changes even gave them a reason to flesh things out more. For example, their decision to make the Valryons Black. That made Rhae’s b*stard children far too obvious and in doing so makes Cersei being able to pass her b*stard children off for years look funny in the light. Ned Stark and John Arryn shouldn’t have needed to read some obscure book to get an epiphany with this obvious example being in their history. Furthermore, with how obvious Rhae’s b*stards look, we should have seen the first one born. That was important to show. We should have seen if Rhae truly tried to get Laenor to fulfill his duty and he refused…could’ve drawn parallels between Maegery Tyrell and Renly Baratheon.
I could go on and on. I am thoroughly enjoying this show. It’s nowhere near as bad as seasons 7 and 8 of GOT, but they could’ve handled a lot of this much better. Like someone else said, we have to accept that this won’t be a GOAT level show, but it’s still very entertaining to me.