Are there benefits in using way way overkill capacitor voltage values?

I ve some doc somewhere of Phillips statistics on long term behaviour of electrochemical caps, what kill the caps
in the long term is temperature and voltage even when used within specs, so better is to use 110°C rated models
and no more than 50% of the rated voltage, if the voltage is say 15V then use 35V caps at least.

For the caps that are in the audio path the higher the voltage the lower the leakage, and the above also apply, of course.