Burn-in revisited

As silly as it might sound, I believe it is capacitor charging and total energy stored in the system that affects the speed/phase of the output going into the speaker or headphone. After considerable power-on time, the electronics collectively achieve maximum stored charge so this will surely improve slew rate so voltages will swing with greater ease and faster pace. The entire signal chain is a cascade of electromagnetism so that is just how I look at it.

There must be a rational explanation along these lines to explain the difference. The sound at initial first use compared directly to prolonged extended use is far too different to be placebo or a figment of the imagination. My increased enjoyment of my music reassures me that something has changed. I am surprised more people who use electrostatic headphones or speakers don't mention how power-on time affects performance. Surely the charge held on the stators will affect the impulse response of the diaphragm, as another example. I think the before and after difference would be quite stark.

Maybe some equipment just is not designed with burn-in in mind? A circuit that does not always draw power for example. Or a circuit that gets very warm, thus prohibiting the leave-it-on-all-the-time practice.