Yea it's politics and side battles for now.
But if Hara does follow the accurate history, Han arc might take a while. Unless they do a timeskip.
I am not sure Hara will follow history for some important events.
For example I do not think Sei will turn evil because it is not compatible with his friendship with Shin. It would take time to establish this inner drama and Hara is kinda rushing now.
Another example is RBK's fate. He should die from Zhao's court corruption, but there is still a small chance that he dies on the battlefield. I still think Hara will follow history for that one because it could serve as a set up for Shin's development as a character.
Last but not least, I am not sure Shouheikun will betray Qin for Chu. It would make for a good battle between him and Moubu but will Hara bother for this type of twist while he seems to be rushing his story.
I'm starting to understand Hara though, Kingdom was peak for so long that to maintain this level of peak he had to finish his story with around 3000 chapters or more. No author can do that, it's not healthy.