I watched the videos and thought the exact same as Alphahawk. These jackets are not bullet proof vests. They can't account for every possible scenario on the water. Their very design is to keep you floating. Some do better jobs at supporting your neck and head, others will float you for a longer period. This is the reason they use "Personal Flotation Device" in the name and try to avoid "Life Jacket".

If face down and unconscious, I have bigger issues. My hope is that my fishing partner is there to help. If not, well, at least I'm not a statistic for not wearing a PFD.