Yep, as someone who just recently setup a hyperconverged mini proxmox cluster running ceph for a kubernetes cluster atop it, storage is hard to do right. Wasn't until after I migrated my minor services to the new cluster that I realized that ceph's rbd csi can't be used by multiple pods at once, so having replicas of something like Nextcloud means I'll have to use object storage instead of block storage. I mean. I can do that, I just don't want to lol. It also heavily complicates installing apps into Nextcloud.