You're not concerned about all your system settings, installed applications, and any other data worthy of preservation on your root disk? Or am I misunderstanding how Root on ZFS works/boots?
No, why would I be?
In what world would you even lose all that?
What specifically would a reinstall cover then? Is it just a boot partition/stub (FAT?) that loads the root ZFS pool? It all seems like a drastically different architecture than I'm used to seeing on a system.
Why would you keep /home on the same partition? Why would you be manually adding in apps after a reinstall?