As a recently former hpc/supercomputer dork nfs scales really well. All this talk of encryption etc is weird you normally just do that at the link layer if you’re worried about security between systems. That and v4 to reduce some metadata chattiness and gtg. I’ve tried scaling ceph and s3 for latency on 100/200g links. By far NFS is easier than all the rest to scale. For a homelab? NFS and call it a day, all the clustering file systems will make you do a lot more work than just throwing hard into your nfs mount options and letting clients block io while you reboot. Which for home is probably easiest.