Most in the Synology world have had their world rocked by removing or limiting third party HHD support.
As a long term Synology user who has better things to do with time than tinkering with TrueNAS or UnRaid and cares enough about data integrity and privacy to not go the Ugreen or Terramaster direction, there's really nothing else on the market but Qnap, meuh, and maybe HexOS.
Too bad it's not ready for prime time yet. I'm watching it but I have to upgrade soon, if I buy another couple Synology boxes, I'm in for another 10 years or so.
Can HexOS replace Synology DSM?
Hyperbackup
Snapshot and Replication
Immutable Snapshot
Drive encryption
Folder encryption
Detailed users permissions
Certificates management
External access
VPN server / client
Security Advisor
2FA
USB Copy
CMS
File Station
Antivirus Essential
Hardware Power
Task Scheduler
External Access / QuickConnect
Firewall
Account brute force block
SHR 1/2 equivalent
Cloud Sync
Space reclamation
Deduplication
It's a tall order, plus if it did not look like a Unix terminal it would not hurt. These functions are way more important than curated apps that can be manually installed in Docker.
What can we expect from HexOS and when