I've found that to be generally true but there's one caveat, it only hurts your neck looking up from horizontal not from horizontal down. Think about how you read a book. You don't hold it directly out in front of you, you kind of prop it up on your lap. I could read for hours like that. Or look at a concert pianist. They'll either be looking at the sheet music directly in front of them or down at the keys. That's why I go with stacked monitors, one directly in front and the other angled between the first monitor and the keyboard.