Great article. I ran into this when finishing a PP project this week. (Usually, I work in Avid, or someone else does the finishing.) My display was set to Rec. 709 Gamma 2.4; Media Encoder made H.264 deliverables that were a bit washed out no my dipslay. I tried the QT Gamma Compensation.cube fix, and it worked well. Unfortunately, when I delivered the files (for web, not TV) the client thought they were too dark; basically, all the people doing approvals used computer monitors set to the default.
So I tested several workflows. The one that gives a great match is to set my display (MacBook Pro) to the Apple Color LCD default, color-grade with Lumetri, then apply the gamma-compensation LUT in Media Encoder. Now the deliverables looked perfect on a computer set to the Apple default — just like I saw in the Premiere monitor when color grading. As long as the deliverables are for the web, I don’t see a problem with that workflow.