Linus Nordberg:
Arguments voiced for migrating to NextCloud include: software momentum; shared calendar and tasks, collaborative editing of documents and spreadsheets; kabana boards; several sysadmins already running NC instances for other things. I suppose that the last argument is not a factual merit of the system, but it is an explanation of how we ended up with a task of finding out if NC is good enough for Tor.
At Tails we started using Nextcloud Talk for some of our WebRTC voice meetings. Jitsi has been a bit unreliable lately and Nextcloud Talk seems to work at least as good for now and we have more control over the infrastructure.