I don't think I give the writers too much credit. I think that was the idea George R.R. Martin wanted to go with Dany. From how it turned out, I believe series was supposed to NOT be about celebrating the return of the Targaryen dynasty but rather play with people's expectations and see how we celebrated and easily justified taking over other kingdoms/civilizations and rooted for a charismatic beautiful leader who had her own trauma and came into her own agency so long as we have this narrative of good v. evil when we sort of failed to analyze it properly. I think the writers probably failed to properly lead up to these endings so that's why the endings feel unearned, random, and rushed. I don't doubt that the ultimate endings are what was intended for the book series though. I think had Martin written them, it would not have this feeling of dissatisfaction that many have now. I read HBO wanted ten seasons and like a movie to lead to this ending with more episodes in a season but the showrunners were just done with this series mentally. They're not really good writers and without Martin's book as a blueprint, they went off the rails getting to where the plot and characters were supposed to go.
My point was the writers didn't want to go in the direction of building the case for Dany's turn. They have stated they wanted to build "shocking moments". For example, forgetting dialogue from seasons ago when writing this season. Season 8, episode 5 Tyrion tells Jaime about the secret or unknown entrance into the Red Keep so Jaime can escape with Cersei. I was like he knew about a secret entrance and never told Dany and Unsullied? The writers either forgot this little tidbit prior to the episode or they're lazy to bring it up now.
Episode 4 of "inside the episode" the writer explains the reason why Rhaegar(dragon) was shot because Dany forgot about Euron's navy and the Qyburn crossbows. The writers explained including a shocking event to further the story that Dany was pushed into her decision to burn Kings Landing by having traumatic events happen to her in short span of time.
Overall for me it was just a sloppy last few seasons with characters not acting like themselves, creating plot armor just for sake of shock value, writing lines for characters contradicting themselves from past seasons of spoken words.