Your data integrity is at risk not using ECC ram (EXTRA ESPECIALLY IF YOU USE SOFTWARE RAID), which is usually gated out of consumer hardware.

Though those poweredges would have had it.

Unless you're sending the Mac mini to space as part of this project, the internal hardware ECC built in to Apple silicon SoC combined with the extremely short unified memory paths removes this as a valid concern

Any software RAID on macOS is a risk I wouldn't be willing to take, but that is another matter entirely and has nothing to do with ECC.