> Other than its native raid 5/6 story what major features is it lacking in comparison to zfs?

For example, native at-rest encryption. dm-crypt/luks is adequate, but has significant performance problems[0] on many-core hardware with highly concurrent storage (NVMe) due to excessive queuing and serialization. You can work around these things by editing /etc/crypttab and maybe sysctls.conf, but the default is pretty broken.

[0]: https://blog.cloudflare.com/speeding-up-linux-disk-encryptio...