One advantage of the newer iMacs is that they can be used as displays
when
they obsolete out.
This is no longer true, unfortunately.
"Note: iMac (Retina 5K, 27-inch, Late 2014) and later iMac models
can't be used as Target Display Mode displays."
https://support.apple.com/en-us/HT204592
Probably for the same reasons Apple can't make a 5k retina monitor for use
with MacBook Pros... Thunderbolt 2 doesn't have enough bandwidth to do it.
You'll need Thunderbolt 3 on both computer and monitor for it.
- Peter
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