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When you use an electrolytic capacitor at reduced voltage, sometimes it gradually reforms and the capacitance and leakage increase. It takes a long time and probably isn't an important issue. And perhaps today's components don't suffer from that.
Paper capacitors don't have a problem. However, the increased cost and size of higher voltage don't make reliability better. In fact, larger capacitors tend to have poorer high frequency performance; i.e., lower self resonant frequency.
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