Thanks! Note that I can, even vaguely, discuss this subject 
Overall, on touchpads, gestures can be triggered anywhere from the desktop. So they can’t conflict with gestures in app windows.
As for the gesture you showed, it seems to me that it would work better with moving a window (going down, then going in the wanted direction) rather than with view switching. But there is indeed the width with which you make a gesture (i.e. a large or slight gesture), and also the speed with which we do it.