ECC is essentially mandatory for ZFS. Assuming that is you prefer your data uncorrupted.

> ECC is essentially mandatory for ZFS

Please stop repeating this old myth, it is - and always has been - BS and needs to die.

See for example: https://kldload.com/zfs-wiki/myths

It's preferred but not having it still works if you're willing to leave some potential avenues for errors to get in. However, it's not like not having ECC is a recipe for a corrupted FS.