Man, I think I've been sleeping on HDR+ special viewing mode.
I tried it way back a couple times just to see what it was like and thought it was pointless, but I remembered one single poster ITT saying they liked using it non-HDR games sometimes.
Felt like playing around with it the other day, so I tried it out with MGSV (PS4 Pro), a game I've played soooooo much that I know it's IQ like I know my own reflection. It's still kinda weird that you can't change gamma from 0 without it looking like negative film burn, and I was still kinda meh about it when I matched it close to my normal Movie or Game Mode settings but after I cranked up the color to 75 (which would be absolutely ridiculous for any other settings, and make everything way too cartoonish/saturated), changed it to Warm2 (I usually only use that on movies, rarely ever for games), and it really looked kinda neat.
Camo fabrics on Snake and enemy soldiers looked really rich and creamy, foliage in Afghanistan was looking slightly more vegetative, the dark skin option for D-Horse looked sweet, and the sandy waves and earthy color variation near some of the more open area bases was really decadent. The night though? That sealed the deal. Fire barrels and warmly lit rooms glowed with intensity, lights really looked more solid and present, and the overall visibility and legibility of the environment was better. Everything was super dark, looking like real night time, but not the crushed-black can't-see-anything kind of night, or the light-blue washed out fake night where visibility is max, but realism and color range is zero.
I've been using it for a couple days now, and I like it.
If you play MGSV and care to experiment with your TV at all, try these specific settings and deploy to the Phantom Limbs mission in Afghanistan or the Pitch Dark mission in Africa, something long enough to let the day/night cycle transpire. Olive Drab camo recommended for some punchy color.
Special Viewing Mode: HDR+
Backlight: 20
Brightness: 35
Contrast 100
Sharpness: 10
Color 75
Digital Clean View: Off
Auto Motion Plus: Custom
-Blue Reduction: 10
-Judder Reduction: 0
-LED Clear Motion: Off
Smart LED: High
Dynamic Contrast: Off
Color Tone: Warm2
Gamma: 0
Color Space: Auto
It's not a purist "as intended" IQ way to see a game, but different, kinda refreshing and pretty cool looking imho. I play the game so much it's like a poor man's mod, or some kind of weird down sampling effect. Looks pretty cool on BroForce and Dariusburst Chronicle Saviors too... gonna try it with other stuff.
I'm sure I'll end up using normal Movie and Game Mode 90% of the time, but I just have new found appreciation for that feature, whatever it's doing.