Must be the name: pinch points. People struggle with getting their head around it. Sounds like some form of ancient eastern message therapy. Or something kinky, maybe.
Actually, the pinch point is the most simplistic and efficient of the story structure milestones.
By now it’s clear that your story must have an antagonistic force—a bad guy or bad girl—and that its first full frontal appearance in the story occurs at the First Plot Point, which closes out Part 1 of your story.
That antagonistic force defines the nature of the hero’s ensuing need, quest or journey. It needs to remain, at least contextually, front and center in the story at all times after Part 1.
But sometimes context isn’t enough. The ...