Don’t forget that the easiest surface to damage is the label side. The pits are just under it! And most CDs are stamped, not laser burned!
Hard to see how the tiny currents in a DAC will help it burn-in. Speakers, cartridges and amplifiers possibly. I put an input power meter on my Krell class A amplifier after a rebuild, and the power consumption definitely rose over a few days, even though it was switched off when not in use.