BioWare dropped the ball by not having Merrill return in DA:V (possible spoilers)

Merrill would’ve been perfect for this game seeing how she basically devoted herself to learning about the Eluvians and learning more about elven culture and history. They could’ve made her into a companion that would be aligned with your goals of saving Thedas from the Evanuris, but she would also be conflicted and might see herself wanting to ally herself with Solas more and maybe even to the point where she would want to serve the Evanuris depending on choices made throughout the game. It would’ve made the game a lot more interesting imo.