MAC monitor preset for Premiere - P3-DCI?

Background information: I work for/with/teach pro colorists, have given presentations back to 2019 at NAB on Premiere's color management, and am in Resolve nearly as much (at times more) than Premiere. Running on a four-monitor PC setup, highly calibrated and profiled for Rec.709 compliance.

One of the first things to lose is any concept that anyone else on the planet will see precisely what you see on you monitor. It is simply not physically possible, period at all. As has been demonstrated numerous times in high-end professional demos, you cannot even totally match two identical monitors, getting the same signal, and both calibrated with high-end spectros first.

Past that, "You can't fix gramma's green TV" is an old colorist's adage. Every screen out there will do things a bit differently, partly because there are no processes that make identical physical screens. They all come off the production line with slightly different behaviors and performance. The ones that are tighter to some uniform response are sold at a far higher price for manufacturer's needing tighter specs.

The rest of the production becomes computer monitors, consumer TVs, and such. Even there, there are differences in reaction to signal. Then take into account what each maker does for hardware to get signal to the screen, and firmware and software ... and then the ambient light levels and color ... 

So why do colorists spend so much money on Grade 1 Reference monitors, that cost more than your entire system, probably including any cameras you have? Because they want to match the general 'center' of the image data, in relative terms! ... to all other professionally produced media.

Macs have an inherent added and infuriating issue, thanks specifically to decisions by Apple. But this issue only affects Macs without Reference modes, that are set to their HDTV setting. Which is that for some reason Apple set their internal color management to use a different display transform than all other systems made.

Macs without Reference modes will apply a display transform to Rec.709 video of app. gamma 1.96. The long specified standard across all broadcast, streaming, and other professional services is set to essentially gamma 2.4

So ... Macs without Reference modes typically show Rec.709 video too light in the shadows, and also do not correctly remap Rec.709's sRGB color primaries to the apparently P3D65 of the Retina screens.

Unless you view that image in VLC or Potplayer, or Firefox browser. Which display the image closer to proper Rec.709 because they do not use Apple's ColorSync CM utility to control image display.

So to your question ... you are correct you are not getting a best-case image.

But what do you worry about? Other Macs without Reference modes, the rest of the universe, what?

And how comfortable are you with the whole "It's a jungle out there anyway ... " concept?

Yes, I've been around intense and deep discussions around CM long enough I'm kind of jaded about it. Knowledge sometimes brings a certain level of cynicism. Sigh.