Oh...my...god, guys.
They actually
DID IT!
I just upgraded to
5.80.10 and immediately launched Forza Horizon 4 still tuned at 4.000 nits, and I NEVER saw the Winter season so bright in HDR Game (non-PC) mode before.
I immediately started to switch back and forth HDR Game and calibrated HDR Technicolor Expert (with Active HDR) and I was literally stunned by their similarity. They're 99% the same now.
To get further confirmation I also tried using the new HDR Game with: webOS YouTube HDR videos, 4K/HDR Blu-Rays and other 4.000 nits mastered HDR games (as Battlefield 1) and cannot be placebo, HDR Game is now almost identical to HDR Technicolor + Active HDR. (Planet Earth 2 4K/HDR Blu-Ray was so MUCH dimmer before with HDR Game compared to Technicolor).
As soon as I can I will update the first post accordingly to reflect this major improvement, and removing any other option, now superseeded.
Plus, I will also include the BT.1886 suggestion for SDR (both for SDR Technicolor and SDR Game) as it's actually a bit better for dark/dim environment, along with minor Color Temp adjustments.
Wow LG, better late than never.
This shit is awesome!