Probably a completely different price point, as compared with the product being discussed in this topic.
If you are looking for a replacement for the box you mention, some people might look at the latest Raspberry Pi, with heat sink rather than fan, even though it doesn’t provide all the hardware capability and obviously doesn’t provide the openness that a hypothetical Purism product would provide.
See also Your Purism products wish list Plenty of people discussing NAS desires, if I recall correctly, and assuming that NAS is the main function that you are interested in.