Since I can't see any other reference to it, I want to mention I'm using openmediavault and export smb mounts for my windows computers and NFS for Linux. It is running in a VM in proxmox. Works well enough for me. It is my in house backup destination, and my Plex media files storage (plex is running in a container on the same proxmox host).
Like most and probably every other mentioned solution, accessing the nas/shared storage is not more difficult than just opening windows explorer on windows and selecting the network location, etc. I'm sure it is easy on Mac as well, but I don't use apple products myself.