What's the distinction between 'medium', 'high', and 'extreme' focus stealing prevention?

i appreciate the ability to configure an environment where typing won't be interrupted by either the arrival of new windows or popups or requests for focus by existing ones.

So i'm using (focus follows mouse, mouse precedence, with) "extreme" focus stealing prevention.

As a result? New windows arrive underneath existing windows. So if existing window(s) fill the screen, new windows aren't visible, until manually brought forward.

That's going a bit too far, i'd say. Focus stealing prevention is good, but hiding new windows isn't helpful.

More sensible, i'd say, would be to let new windows arrive where they can be seen. Or if a window raises itself, let it become visible. But, with extreme focus stealing prevention, please refrain from giving focus, even if it requests focus, even if it arrives under the mouse pointer, even if it steals the mouse. Give focus only when the user moves the mouse across a window boundary onto a window, or clicks. Presumably meanwhile the titlebar color is revealing where focus is or isn't.

About this System: http://imgur.com/a/5JkksDx