There are numerous ways we could be injured in a self-defense instance - not to mention being injured before you are involved in a self-defense incident. (Broken wrist anyone?) Knowing how to accommodate injuries while accurately shooting is incredibly important to your physical self-defense.
Have you trained while injured? How did you adjust your training?
Remember, upper body injuries aren’t the only type you may encounter. Have you been on crutches and had to practice drawing? Or even trained to evade on crutches?