I think this show is really good but it's jarring when the actors change as they jump in the timeline. I feel like the new Rhaenyra is a different person who I have no relationship with. One of the great things about GoT is they let everything breathe a while and it was easy to feel the importance and impact of everything. If Harwin was introduced to us earlier in the series, I don't even remember him. He had bastard kids with Rhae for about 5 minutes of screen time before they murdered him (by his brother, who I also do not remember existing before that incident) and it was too sudden to really feel much of anything about it.
Also, I don't really understand Alicent's becoming so cunning and vengeful, etc. She just seemed like such a sweet kid and then she became such a Karen about Rhae's scandal. I understand that her Father put it in her head that Rhae might kill her kids because of a claim on the throne, but Rhae tried to resolve that and Alicent rejected it, so her motivation straight up is not about saving her family. Why is she the way that she is? Why did she change? I know we can easily attribute her reasons, I'm just saying I don't think they did a good job with that character development.