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Does macOS still not support DP-MST properly?

Doesn't support on purpose, though on intel macs alternative OSes could use it.

DDC is also fraught with peril when you want to change settings from OS on non-Apple display.

Properly? I thought not at all.

Apparently, if you connect two identical monitors to a mac via dp-mst, it will display the same image on both monitors.

I'm not sure if it's intentional, but it is at least giving an image.