Um... no, they didn't. There's only one slider and that is for Gamma. There isn't even a Brightness slider, but that doesn't matter, because these issues listed above aren't something that in-game sliders would fix since the core of the issue is inconsistency.
I got a full set of sliders before even getting into the main game menu. They poped up on the first start of the game after installation and only then.
Edit : Maybe you didn't get them because of a bug? I'm runing D Vision HDR screen so maybe that's the difference i don't know... The game sure looks amazing on my screen.
Just checked my game. No sliders popped up for me and only the gamma slider found in video options.
Also, personally I dislike the idea that 2 millions+ customers of Larian should have to manually fix what Larian imo broke
