The pointer is a tool for tracking gaze and fixations as well as activating interactive controls. In this context, elements that display on hover are obstacles, keeping people who use the pointer from seeing what they want to see and working with what they want to work with. Hover effects are particularly intrusive for people who use screen magnification and a large pointer cursor to focus. Honoring intention by responding to click rather than hover is definately the way to go. Thanks for the great article!