you’d never have player movement in the GameManager class
You want to bet? (Source: I teach game programming on a college level.)
But yeah, your comment about the gear icon is sadly more true than people may realize. Game developers do questionable things. => Engine developers cater to people. => Students argue that if something is supported it can’t be that bad. Sometimes it feels like fighting windmills.
The real naming fail is calling the class “GameManager”, still my number one pet peeve. With a class name as vague as that you would have to add tons of information into the variable name. (Also the class name begs for unorganized code. I mean name one function or variable that you could not justify putting into the “GameManager” class. After all if it’s managing the game it could justifiably perform any process in the game and access any state in it.)
Once you put the first bool into a class with a name like AccessibilitySettings, calling it something like HighContrast is completely sufficient.
You may enjoy having a look at F#. It says that it’s “functional first”, but I think a better description would be “an opinionated version of C#”.
For example it doesn’t have a “const”-keyword. Instead it has a “mutable”-keyword, because everything is const by default.
At my first job I was working on an MMO and we had a DatabaseManager class with 10k+ lines of code. Less than the first 200 lines actually used any of the members of that class.