SITAEL has published an article demonstrating the relevance of direct-drive architecture for space electric propulsion (Hall Thruster). Even though the publication does not stem from EDDA research , it underpins the great opportunities direct-drive can bring to space industry. Please find the article below :
Characterization of a high-power Hall thruster operation in direct-drive. Acta Astronautica
Volume 178, January 2021, Pages 392-405. Authors : Maryam Reza, Farbod Faraji, Tommaso Andreussi (SITAEL).
Link to publication : https://www.sciencedirect.com/science/article/pii/S0094576520305464