My concern is since both monitors have MacOS control, does it mean I can adjust Brightness/Volume and have the Ambient Light Sensor working together or independently? Connection over TB3 (5K) USB-C (4K) certainly allows control but how about driving the 4K via HDMI?
Also I just realised on the 2018 Mac Mini it only supports One display with 5120-by-2880 (TB3) and one display with 4096-by-2160 (HDMI 2.0), not the 4096-by-2304 resolution over HDMI 2.0. Well not sure if it's the Intel 630 limitation. Now if I want the best performance, obviously the only eGPU that'd support the 5K via TB3 connection seems to be the Blackmagic eGPU, but can I drive both 4K and 5K through the Blackmagic's?