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I think they are over-optimizing a no-issue. Nobody around me complained over my MBP2015 keyboard noise, neither about my MBP2010

What does those old models have to do with the new keyboard?

Nothing. It's just a True Apple Believer's attempt to introduce some FUD.

There are specific complaints about the new ultrathin 2016+ keyboards being much louder. The 2015 or 2010 keyboards are not relevant to this.