@SLG_K thank you for the clear and extensive reply!
The one thing that is very interesting to me is that apparently an invert y-axis toggle (for mouse looking) is considered "abnormal" or "unnecessary" by quite some folks.
I have been playing games since MS-DOS (a lot), and literally every one I played that employed the mouse for looking around included an "invert mouse" setting. Even if there are hardly any settings, there is always an "invert mouse" setting. No exceptions.
In my opinion, it is the most crucial setting of all settings. I am amazed that it is even a discussion point. Imagine that every time you want to look up, you look down, and visa versa. Now imagine there is no setting to fix this mind blowing behavior. Welcome to the world of 50% of all gamers. It is like denying that left handed people exist (who make up 50% of humanity).
All the other features I mentioned are secondary and merely my opinion. Invert mouse is not an opinion, not even a discussion, it is an essential part of the controls. In my opinion.
I'd love to be proven wrong though. Find me one game that uses the mouse to look around that does not provide an invert mouse setting.