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Wait, what's wrong with issuing "ZFS Scan" every 3 to 6 months or so? If it detects bitrot, it immediately fixes it. As long as the bitrot wasn't too much, most of your data should be fixed. EDIT: I'm a dumb-dumb. The term was "ZFS scrub", not scan.
If you're playing with multiple computers, "choosing" one to be a NAS and being extremely careful with its data that its storing makes sense. Regularly scanning all files and attempting repairs (which is just a few clicks with most NAS software) is incredibly easy, and probably could be automated.
I guess, my primary concern was if I didn't have the computer with ZFS(in my case btrfs but similar thing). Maybe it is for the best that I keep the raid setup to scrub and make sure important data is safe, and use the smaller single disk mini PC for services and data that isn't as important.
If you have a NAS, then just put iSCSI disks on the NAS, and network-share those iSCSI fake-disks to your mini-PCs.
iSCSI is "pretend to be a hard-drive over the network". iSCSI can exist "after" ZFS or BTRFS, meaning your scrubs / scans will fix any issues. So your mini-PC can have a small C: drive, but then be configured so that iSCSI is mostly over the D: iSCSI / Network drive.
iSCSI is very low-level. Windows literally thinks its dealing with a (slow) hard drive over the network. As such, it works even in complex situations like Steam installations, albeit at slower network-speeds (it gotta talk to the NAS before the data comes in) rather than faster direct connection to hard drive (or SSD) speeds.
Bitrot is a solved problem. It is solved by using bitrot-resilient filesystems with regular scans / scrubs. You build everything on top of solved problems, so that you never have to worry about the problem ever again.
Steam also works with NFS just fine (at least for the libraries, maybe not a full Steam installation), although Samba can be problematic in my experience. But your overall point is reasonable.