DAS is 1:1, It’s more or less like just connecting en external hard drive to your computer.

SAN can do some crazier stuff. You can take arrays and attach them to LUN’s and to sign lungs to separate computers. You have fiber optic routing and virtual networks, sometimes iSCSI. But that stuff is extremely expensive and power hungry and did I mention extremely expensive

NAS is basically just a computer with disks attached to it sharing the data through one of her protocols you need.

For home gaming, even sharing with a extended family, truenas, unraid, or just a computer with ZFS is ideal.

ZFS is the elite but slightly harder way to do it. Your volumes all need to be the same size even if your disks are different sizes. There’s regular maintenance that needs to be applied, But it’s very fast and very flexible and very easy to expand.

Unraid is very slow but very flexible, the discs aren’t in a raid they’re in a JBOD, so really really slow, But if you lose one disc all you’ve lost is the data on that disk, and you can run up to two parity discs. As long as you’re parity drives are larger than your largest data drive.

Truenas is more of an unraid type situation but with a ZFS. Both unraid and truenas support virtualization and/or containers for running applications and give you nice metrics and meters and stuff.

You can hand roll with Debian, ZFS, docker and proxmox.

I think DAS is pretty much dead. If you have a ton of ephemeral data, and you need to do high speed work on it It’s a reasonable solution. But I think for the most part eight terabyte nvme has made it pretty niche.