Oh, don't get me wrong, I love Sera a lot. I love bits like the pranks scene, the hat gift when you romance her, and the fact that when you asked around people's opinions about what gift would please her, just the fact you did that makes her happy beyond belief. Or that bit about pride cookies. I would never want to kick her out of my Inquisition, much less so not recruit her.
I don't see my Inquisition without her, I love her take on the little people, sticking up to the nobles. I'm pretty sure she's the only one having that kind of point of view, and my Inquisitors value that, even though at times, they totally disagree with her, find her insensitive and a bit of a jerk. But my Inquisitors know also that it is necessary to keep her around, because she's a breathe of fresh air when she wants to be, and because her point of view is something they don't want to dismiss. All other companions are mostly educated people, coming from privileged social classes, and she's the only one I'd consider coming from the lowest social class, and I wouldn't want my Inquisition to become a circle-jerk of people having the same opinion on everything.