Apple axed their displays and LG (nor any other brand) is not up to the task to replace them.
A petition to ask Apple to make external Mac displays again:
https://www.change.org/p/apple-apple-make-external-displays-again
Unlikely to succeed — but still... 
Hard to admit because I'm a mac lover but apple is finished making anything great again. As well as the end of anything meaningful to warrant saying "one more thing".