I've run my own Home NAS on ZFS for 4 years or so. In the end I ended up with majority NVMe setup with long-term archival storage on HDDs. This made my NAS much more useful / ergonomic since I can search, move files at 10Gbps speeds. I really hated the pause when opening up directories, etc. Details here:

https://benhouston3d.com/blog/home-network-lessons

With the metadata stuff they added you could put metadata on nvme and keep the spinning rust. All flash is nice though but not as economical as this.