I see a lot of confusion btw burn-in and break-in, here is AI definition, which I agree with:
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Burn-In: This is a process used primarily in electronics where components are tested under stress (elevated temperature and voltage) to identify early failures. It helps ensure reliability by weeding out defective parts before the product is fully assembled and used.
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Break-In: This term is often used in the context of audio equipment, particularly headphones and speakers. It refers to the gradual improvement in sound quality as mechanical components settle and adapt to use over time.
I design analog circuits, mostly to use in large, 1b+ gates SoC (system on chip). SoC manufacturing has a burn-in (accelerated aging) step. Accelerated aging requires to stress key spec parameters, such as temperature, increased voltage, frequency., etc. All these steps are included in design process, and verified by extensive simulations. Devices in circuits used with small margins to max allowed conditions are aging faster than devices in relaxed usage conditions.