Ugh, Nextcloud. It is always touted but it is such a pain to set up properly,

The problem is mainly maintenance - they do YOLO style database handling, so you can’t miss any release or you have fun upgrading. Plus you need to kick it after installing to upgrade the databases.

Other services (like SoGO) have proper upgrade scripts, and automatically adjust the database schema from pretty much any version on first start after upgrading.