Parent post said if it were dust, the keys would be randomly affected. Which AFAICT (after discussing with Apple store employees) is indeed the case. Some keys

Parent post said if it were dust, the keys would be randomly affected. Which AFAICT (after discussing with Apple store employees) is indeed the case. Some keys are slightly more prone to dust, eg the space bar because of its size, but any key can fail. Your concern is I’m sure valid, but orthogonal to the post I was replying to.