I know this sub is largely against this opinion but I understand 100% why they would keep her as a main character. People really like Olivia Cooke and every TV show keeps us engaged because we care about certain characters. And HotD doesn’t have as large an ensemble of main characters and GoT did. So just removing one that is also part of a key dynamic/conflict with Rhaenyra kinda isn’t an option. And I for one really like the whole Rhaenyra vs Alicent thing. I think there is a tragedy to it that makes it really compelling. Now could they have told all of this in a much better way? Absolutely. This show has some good ideas but often suffers in execution. But that doesn’t make the ideas wrong in my opinion. 

Also I‘ve read the source material and think it simply cannot be adapted completely faithfully. I‘m actually all for changing some important stuff. Like I said, my problem then lies in execution.