Also the Nextcloud Box looks quite complicate to me, in order how to get ssh access etc. with all that snap/ubuntu account thing. I just refer to this and other similar topics: Nextcloud Box - Can't access via SSH
I mean the question still is, if it is actually wanted/possible to create something like Nextcloud for absolute Linux/Network beginners, especially in times where so much things around platforms/operating systems/security changes in high speed. I personally think that a little reading/understand/tinkering around this topics will always be necessary to maintain a secure stable server anyway.
On the other hand. Giving as much people as possible the control over their data and web services into their own hands still benefits from sample fast setup, especially in case of Nextcloud box which definitely has private beginner servers in mind ;).