Let's explore bedding in electronics. What??? Does this mean our toasters, refrigerator, lamps aren't optimal when first purchased? Taking the car analogy, does this mean we should idle our cars for 100 hours or so before driving them? Imagine the safety concerns if this were true. Do the same instructions come with our computers? Our electric toothbrush? Where outside of this hobby have you ever heard that electronics get better over time?
On to drivers. If 100 hours breaks them in (I presume the conventional thinking is that this loosens them up) what happens after 200 hours? 1000 hours? Do they loosen to the point that they're flappy?
The purpose of engineering is to design a product or solution to a specific and consistent end state. If that end state is unknown at the time of manufacturing the engineering is flawed.
Pure snake oil. If I had to guess this one was cleverly devised to reduce 30 day returns. It works, but only because our ears break in, not our electronics or our speakers.