Books are being labeled romantasy based on aesthetic, tone, and the presence of romance. The covers signal it. The blurbs reinforce it. The comparisons lock it in. That is not what defines the genre. Romantasy is not built on whether a relationship exists. It is built on whether the relationship is necessary. If you remove it, does the story collapse, or does it keep going? That is the line. And the fantasy has to matter just as much. The relationship and the world have to work together to determine the outcome. If either one can be removed, it isn’t structurally romantasy. And right now, most of what is being sold as romantasy falls on the wrong side of it.