I think it's too short-sighted to dismiss the Solas/Sera relationship as simple hate/dislike. Because it isn't actually. If you keep bringing them along together, they will get a lot more friendly and respectful (as much as Sera is willing to show respect in general). Solas acknowledges her strong will and her readiness to act where others (including himself) only talk. He even admits to be jealous of her motivation and determination. It's not mindless bashing, it's rather like checking foreign territory and overcoming differences in the end. They are not the typical friendly banter people, but they are equals and I actually enjoy listening to this; because Solas hardly ever acknowledges others and Sera gets a sort of respect no other NPC gets from him.
Definitely. I think contentious interactions between characters are often very oversimplified, and then people start to feel like they must choose sides. As though it's always one or the other, even when the two characters are designed to represent different extremes, and sometimes they even strive to understand each other.
I found the dynamic between Solas and Sera very interesting. Sometimes it hints at contempt, and sometimes something much more complex. Two people who are both outsiders in their way, who don't see themselves as being a part of Elven culture, and at opposite ends of an axis in terms of how they react to being outsiders.
My favorite banter might have been the one where Solas told her to look into the breach, and she actually because very pensive for a moment, as though reflecting on something beyond memory that managed to resonate with her, and then she candidly told him how he "makes her head hurt." His response was almost regretful. And lonely. I think that for a moment he wanted to make her understand it as he does, so that at least someone would.
He confuses her, and she frustrates him, but neither reaction is simple. I think it's excellently done.