ZFS and BTRFS could update their codebase to account for these (if they haven't already), but I agree that their extra mechanical parts worry me. I really don't care about speed - if you run enough HDDs in your RAID then you get enough speed by proxy. If you need better speeds then you should start looking into RAM/SSD-caching etc. I'd rather have better reliability than speed, because I hate spinning rust's short lifespan as-is.