Look I haven't watched the finale of GoT I am like a few seasons behind. But like, wouldn't the Daenerys going mad thing have worked, if it was an established fear. Like if she had continued to hear stories about her father and fearing becoming him. Because I feel like, if it had just been a small part of what she was scared of from the very beginning and continued with like the: Tyrion meets her and she starts off by saying I am not my father, I am not going to go mad. Because if it was an established fear, and something you would have seen her struggle with, with the few people she killed. I feel like when she got her dragons and got stronger her arc could shift to the: I am powerful! Thing she got going on. And then the streak of her wanting to become powerful and free people like she had freed herself, would eventually become this obsession and that need for all of that, and her unwavering morals that would then become her downfall and eventually lead her to follow in her fathers foodsteps, which would have been something (that then would have been established as a fear of hers).