Oh no... Roundube was the top selfhosted email client. Nextcloud is great, but having everything and the kitchen sink maintained within and by it is worrying.
Roundcube is still to be it's own separate project. Besides Nextcloud already has it's own webmail client. I imagine they might make it easier to install Roundcube as an APP though. The the existing implementation (that doesn't work for the latest Nextcloud anyway) requires an existing separate Roundcube installation.
