> Well, perfect except that six years in this machine is very creaky. It needs a reboot every week or so (otherwise it will refuse to launch anything). That sounds totally unrelated to the age of the machine, and totally related to what's installed, the mini running out of disk, etc. Maybe do a clean install of the OS? Aside from the mechanical parts (CD ROMS, Hard Disks, etc), the "digital" parts of a PC do not age…
There is one factor that heavily affects performance that you haven't addressed though: Software demands on hardware increase over time. MacOS today is more demanding than the MacOS of six years ago. Even if the hardware is in perfect condition, you can't run all six-year-old software, so it's going to be slower.
This tiny little Zotac ZBOX that I got for $150 off Amazon has a less powerful CPU than the 2010 Mac Mini from the article and Windows 10 flies on it.
https://www.amazon.com/ZOTAC-Quad-Core-Graphics-Barebones-ZB...
Honestly, I can't fathom why anybody would have chosen a Mac for an HTPC within the last decade to begin. I can see why people would buy an Apple TV, but if you want the "full" OS because you want to do more stuff - you can't beat Windows.