The problem with this is, with the lack of any space at all, there isn’t even room underneath for a bag. I always fly with a backpack, I also am a taller guy. If I put my backpack underneath the seat in front of me, my knees would be in my chest for the entire flight. Therefore, it always goes above. My logic is, I am as entitled to space in the overhead bin as anyone else. Also, I’m usually traveling with my family of 4 and we almost always only have 2 backpacks. So we always under-utilize our space.