I’ve been running and upgrading it for about four years now—so across about 11 different major versions. Prior to that I was actually on ownCloud and migrated s

I’ve been running and upgrading it for about four years now—so across about 11 different major versions. Prior to that I was actually on ownCloud and migrated straight from that to Nextcloud. Every upgrade or migration has taken like 5 minutes. I’ve yet to have a single problem and it’s required zero maintenance between upgrades. It’s actually one of the few pieces of software that I self host and don’t fear updating. Many people have obviously had experiences different from yours given it’s popularity. Speaking in absolutes as you’ve done really isn’t helpful to anyone.