I certainly do talk a lot about fanwork’s transformative quality, that’s why I found the below reminder welcome:
(…) in a transmedial perspective, fan fiction can be seen as one more instantiation contributing to building up a collectively imagined fictional world, and not as something in conflict.Tosca, Susana 2021. Appropriating the Shinsegumi: Hakuoki Fan Fiction as Trnasmedial/Transcultural Exploration In: F. Gilardi F. (ed.), Lam C. (ed.) Transmedia in Asia and the Pacific, Palgrave Series in Asia and Pacific Studies doi.org/10.1007/978-981-15-7857-1_8
It is important to see how fanworks are a variation of the original work, but one should not abandon examining what it repeats, what it uses of the original work.