>Some of the old iMacs could just be displays natively.[1] it was just an odd ball feature no one used.

This oddball Apple cable sits proudly in our "old proprietary Apple cables" cardboardbox (Thunderbolt2 is NOT DisplayPortMini, despite their physical interconnectability)... and are now worth ≥$65/each.

Too bad my 2009 iMac 27" is still alive, occassionally requiring that cable's usage; a more-powerful 15" MBP can then use it as its main display =D