Apart from the right tension level of your strings, their elasticity is crucial for a good playing feeling. Elasticity is the ability of the strings to stretch at impact – and most importantly, the ability to contract quickly again to kick the ball out.
This elasticity – and thus the energy – of every strings decrease over time. The consequence of worn out strings are not only a lower ball acceleration and less control, but also a poorer shock-damping performance. And this means more stress for your arm- and shoulder joints.
CONCLUSION: No matter, whether you prefer high or low tension levels – your strings should be fresh!