On my first playthrough, I wasn't sure I wanted to be with him yet (was barely discovering characters), so I didn't kiss him in the Haven/Fade scene.
Little did I know it would lock me out of a Solas romance forever for that playthrough. Which was pretty infuriating, because not long after that scene, I was sure he was the one I wanted to romance. But I couldn't do it anymore.
I think this option came a bit too early in the game for me, so it was frustrating to complete that first playthrough, being in an unrequited love with Solas (yeah, still managed to be his best friend).
I think they should have made the romance option available as well at the end of his personal quest, even if you hadn't kissed him in Haven/Fade.