I went to check my custom built FreeNAS one day, and it's off, and it wouldn't properly boot so I needed to haul a monitor out to see what was going on...
I finally hit the age where I don't care to deal with shit like that anymore, and finally pulled the trigger on a synology. Couldn't be happier.
It was fun setting it up and configuring FreeNAS the way I wanted, but overall bleh because I didn't get the right HW (went dual core atom at the time, not beefy enough for plex re-encoding).
Recently I replaced it with a barebones Arch install and it works just as well for home use, and starts fast and reliably. I think FreeNAS middleware is overly complex for home use if you are at all comfortable with administering things yourself (ZFS really makes it easy).
FreeNAS might make more complex things you'd do in an enterprise environment easier, but I think for anything you'd want to do at home, a basic Linux install would probably be easier. (eg. installing media server software, setting up a VPN server, even running a VM, etc.)
Your conclusion is not supported in the mentioned URL.
What has been described in the URL could've happened with a FreeNAS or TrueNAS or Open Media Vault system or just about any system. RAID is never a backup, and one backup is not enough.
My point is that both options have similar chances of breaking unexpectedly.
You're only going to get actual, reliable and useful numbers about failure rates between competing products by doing actual studies and analyzing the aggregate results. Anything else is meaningless. And as a buyer, I'm more worried about things like warranty and technical support quality, frankly, if I'm going to buy a prepackaged system anyway, which are easier to gauge from afar.
Instead of buying a replacement synology, and moving the drives (which are all fine) he dumped the data to various other devices using Linux raw LVM, and restored 100% of the data.
This seems like it worked as intended to me (not counting the simultaneous loss of the USB stick and motherboard). Anyway, any NAS that contains important data should be backed up offsite.
Is there anything better than RAID? That's what every file system seems to use and it's honestly not very good. High capacity arrays can take over 24 hours to rebuild and during this time the risk of additional failures is even greater due to read errors. RAID also requires matching capacities for all storage devices, making it hard to expand capacity of the whole array.
The only alternative I can think of is object storage which is not exactly made for home use.
You could just buy a costume build FreeNas OS driven NAS, like the FreeNAS Mini for example.