Some people claim to able to get 30 bit by using SwitchResX, others claim that Thunderbolt and Black Magic boxes do 30 bit. Video apps support it. I have seen TFT Central claim that using the i1Display Pro to profile with the Dell UltraSharpCalibrationSolutionSetup.exe by setting the monitor's LUT produces the ultimate calibration, but I fail to see how, since the monitor is getting DVI video from the Thunderbolt port and it's 24 bit. The software may be producing 30 bit but the display is showing 24 bit which the colorimeter is reading as what? and sending what? to the LUT.
They also say that it's great, without mentioning anything about 30 bit or setting a Win machine for 30 bit, which some say screws everything up.
I'm not saying I'd know the difference, my eyes are failing, but for _____ sake I've had a 48 bit scanner for a decade, printer output is 48 bit, movies and video are going high bit depth soon, what is Apple thinking? They're not, in my view.
No, color management isn't messed up, it's a disaster.