Apple's attitude to the Mac mini truly confuses me. Many years ago I was interested in getting one for eithet iPhone development or as a media pc but every time I looked they kept seeming to jack the price or downgrade the spec (relatively speaking).
I'm probably speaking for thousands of people. It's been complete frustration to see what Apple hasn't been up to on the Mac front. Apart from not updating a few ranges for years (and introducing updates that reduce or remove the kind of expandability the core Apple customer base wants), not reducing the price of old systems is highly insensitive on the part of the company. It looks like in another one or two years macOS won't support some of the aged hardware that Apple sells. That may be the time it'd completely junk those ranges. It's sad to see this.
Though lacking in certain ways, the HP Z2 Mini seems like a decent alternative for people who can move out of macOS.