ZFS makes it way easier to do backups via snapshots.
I've been using this RAID layout for a while, mostly for performance:
https://battlepenguin.com/tech/copying-linux-between-machines/#raid-0-overview
I all started when I got an MSI gaming laptop that had two M.2/SATA drives setup in RAID0 by default.
I do work with a lot of small files, but I'm not sure if I'm really getting performance gains anymore with newer nvme drives. I might do a benchmarking post at some point. I do have a single Gen5 M.2 slot, so I might go to a single drive later down the line.