But Apple didn't support its own concept by abandoning its Cinema Display series.
...well, the original idea of the Mac Mini was a "cheap" Mac for people who already had a display or who wanted to buy a cheap one. "Bring your own keyboard and display" was the motto - and the Cinema displays could never be accused of being cheap. In terms of cost, if you wanted a premium Apple display (in 1440p when that was new, later in 5k) then the 27" iMac has always been a no-brainer - a major reason for considering a Mac Mini is if you
don't want an iMac-style display.
Ultimately, the reason for Apple dropping the Cinema display is most likely that they weren't selling well - by that time there were plenty of nice 1440p displays on the market at a fraction of the price.
So now I'm switching to the iMac 24inch.
With this, Apple has lost me as a MacMini customer
...and gained an iMac customer, so I doubt they're crying into their beer.
I do sympathise with the idea of keeping a display longer than the computer, but if I bought a display "for the ages" it wouldn't be Apple unless they totally change their design philosophy. The cheapo Del 4k I have alongside my iMac has DisplayPort, Mini Display Port and 2xHDMI so I can use it with my old Apple TV or Amazon Fire, a Chromecast, a Raspberry Pi, my 2011 MBP... All the Apple Displays have just featured
one of Apple's current favourite port (so a captive MiniDP cable for the 27" Cinema Display, Thunderbolt 1 for the Thunderbolt display pr 1xTB3 for the obviously-made-to-apple-specs LG Ultrafine). That seriously limits their uses in the future.
In my case, I'm waiting to see if there's a new M1X/M2/whatever Mac Mini so I
don't have to get another iMac - but part of the point of that would be to get a non-Apple display (I'm thinking of a pair of ~24" 4k displays rather than one large 27").