Looks really nice and seems like it should be a great foundation for future development. Personally I can't lose Nextcloud until there are sufficiently featureful and reliable clients for Linux, Windows, Android that synchronize a local copy and help manage the inevitable file deconfliction (Nextcloud Desktop only barely qualifies at this, but it does technically qualify and that represents the minimum viable product for me). I'm not sure a WebDav client alone is enough to satisfy this criteria, but I am not going to pretend I am actually familiar with any WebDav clients so maybe they already exist.