P3 color gamut support is a must...
Short of getting an expensive calibrated broadcast monitor, which is certainly required in a lot of cases, there is no accurate way to measure color from a new iMac Pro.
The system has been out for nearly a year and yet still no fix to this fundamental issue. If other Adobe programs can support it, then why not Premiere Pro? I am genuinely curious as to why this can't be or hasn't been implemented yet.