[throw0101b]

> I feel like the need for a triple-redundancy option in RAID is superseded by more “advanced” software “RAID” at the file system level such as ZFS or ButterFS (to an extent).

ZFS has triple-parity with RAID-Z3:

> The need for RAID-Z3 arose in the early 2000s as multi-terabyte capacity drives became more common. This increase in capacity—without a corresponding increase in throughput speeds—meant that rebuilding an array due to a failed drive could "easily take weeks or months" to complete.[38] During this time, the older disks in the array will be stressed by the additional workload, which could result in data corruption or drive failure. By increasing parity, RAID-Z3 reduces the chance of data loss by simply increasing redundancy.[40]

* https://en.wikipedia.org/wiki/ZFS#ZFS's_approach:_RAID-Z_and...

The use of software versus "hardware" (firmware) does not remove the need for extra copies of data.