Why isn't Contrast in the general Settings? - Android Q&A, Help & Troubleshooting

I've had a problem for quite some time where Google Maps on my OnePlus One displays the normal Map view in near-zero contrast (no matter the screen brightness). You simply cannot tell, looking at the screen with the human eye, the difference between roads and not-roads. In Satellite view it's fine (but of course uses much more data, memory, CPU, etc, and Satellite view is much busier on the screen, so that's not a long-term acceptable solution).
I'm running CM13 on my OnePlus One; there is no Contrast setting. (In Accessibility there are a couple of related ones, but they don't actually control contrast, and they don't solve this problem, and they're both marked experimental - may impact performance).
I found an app, Netman "Screen Adjuster", which works perfectly .. but has to be always running to hold the contrast adjusted, leaves a post in notifications (despite its option to not do so), is ad supported, etc - simply should not be necessary.
Why isn't there/ how can we add/ who do we beg/pay to add a Contrast adjustment to the normal Settings in CyanogenMod 13 ?
thanks!
Content of my post from CyanogenMod forums:
On my OnePlus One running CM13 [nightlies] - I'm not sure if this specifically started with my upgrade some months ago to CM13, or if it was this way on CM12 before also - the contrast in Google Maps is much too low. Basically it's impossible to see the difference between road and not-road in the normal Map view. If I switch it to Satellite view then everything displays fine. On some other forums I've seen similar complaints both from OnePlus users and from users of some other platforms. So it's a maps+contrast thing, not exactly specific to this model.
I've attached two screenshots and a camera photograph of the same Google Maps display:
One screenshot is of normal Map view, which viewed here displays perfectly, so it's not the actual graphic content, but how the OPO screen displays it.
The other screenshot is of Satellite view, which viewed here and with human eyeballs on the OPO's screen is fine.
The photograph is of normal Map view (I tested both with the screen brightness quite high and the also quite low, both show near zero contrast making the map view unusable to the human eye, so I'm only posting one photo here).
My guess is that either contrast or something about the graphics drivers for the OPO in CM13 are causing the valid underlying graphic bits to be displayed in very low contrast.
I'm not sure why I don't notice this in other programs, just in Google Maps.
Hm. It's definitely the OPO's Contrast setting. I found an app (which I don't like as it has to be always running to keep the contrast set properly) "Screen Adjuster" by "Netman" which makes Google Maps perfectly readable by setting Contrast to "-100" (exactly halfway between the default 0 and the maximum).
So, without using some dodgy app, how to control Contrast on OPO or more generally in CM13?
thank you.
Photo of Map view - no contrast:
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Photo of Satellite view - looks fine
Screenshot of Map view (exactly the same thing in the first photograph) - displays fine on YOUR screen which has proper contrast, just not on a (my?) OPO:

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Try to change the color temperature. It might do the trick. Settings>Screen>Color temperature

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Now, that's interesting.
On my OPO with CM13 within Settings -> Display & lights -> LIVEDISPLAY, I had Display mode set to Outdoor (which seems to boost display brightness and whiteness, though in no place does it speak of contrast).
It has Color Temperature (which did indeed help .. at the expense of some need-to-get-used-to-that color variations; I've re-set those to the defaults of 6500K day and 4800K night), color calibration (100% for each of R/G/B, and changing that is definitely not what I was looking for ), Power consumption (no effect) and Enhance colors (no effect).
So while color temperature makes a difference it doesn't seem to be the ideal... but I played with Display mode, switching it from Outdoor to Automatic, and instantly Google Maps became readable.
This is in my home office, which is presently lit by subdued outside lighting on a clear sunny day. I need to go outside and stand in full direct sunlight to see if Automatic goes to Outdoor and again washes out Google Maps displays to zero-contrast unreadability.
It still seems weird that Contrast is controllable (witness "Screen Adjuster" and several others) but there is no Contrast control in Settings.
Many thanks!

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Im glad that helped