Thinking about it next day, one of the details I really liked was the final ending to the original kingsguard. Jamie, the Hound, the Mountain - they were the last.
You can really feel it when Cersei says her own soldiers will defend the city, but Jon and Grey Worm face down a sea of scared no-names who drop their swords. Where are the legendary protectors of regimes past who could cut down anyone who crossed their path? All gone, starting in season 1, many due to Cersei's/the Lannisters increasing ruthlessness.
When the Hound goes to face his brother, the point is driven home: he nods to Cersei and calls her "Your Grace," making it clear he hasn't forgotten who he is. Then he cuts down the whole pack of her worthless replacement soldiers.
With the deaths of Varys and Qyburn as well, the old order really is gone. Who's left to rule the great houses now? Bastards, daughters, dwarves. A lot of people suffered as a result of the destruction, but maybe there is something to a clean slate.*
*Assuming GRRM's writing will actually explain Dany's actions better than D&D.