In early 2014 I installed my file server at home with FreeBSD 10.x on zroot. Since then, the hardware was exchanged once (zfs send and receive to "clone" the old system to the new one) and upgrades took it through all versions of FreeBSD 11 (from 11.1) and 12 (from 12.1 through 12.4) and today to 13.2. Even with all that "abuse", the system remains rock-stable and upgraded (via build from source and reinstall of all ports) without a hitch.
Just posting to say thank you to the project and voice in that upgrades are more reliable than for any other OS.
Just posting to say thank you to the project and voice in that upgrades are more reliable than for any other OS.