Lack of Buoyancy Control
Poor buoyancy control can result in descending deeper than you intended or ascending more quickly than is safe. By adjusting the amount of air in your BCD you can help minimize this problem
Having to make constant adjustments in your BCD uses air more quickly which will impact the amount of time you have to dive.
Ear and sinus injuries often result from poor buoyancy control. During descent, if a diver feels uncomfortable they should stop the descent immediately and ascend until the pressure resolves, attempt to equalize again, and then continue to descend if everything equalizes. The same is true on the way up. If you feel pressure upon ascent, descend until the pressure subsides, equalize, and continue the ascent slowly. Without proper buoyancy, this can be difficult to impossible.
Most marine life injuries happen because of accidental contact between the diver and the marine life. Proper buoyancy helps keep distance between the diver and the marine life to minimize the risk of injury.
Your diving experience should be a comfortable and pleasurable experience. Maintaining proper buoyancy can help ensure that you have a good time exploring the underwater environment!