This reminds me of a blog post in German [1] by a person who due to a software bug had been falsely diagnosed by 23andMe with limb-girdle muscular dystrophy. (Fortunately, he was able to identify that it was a misdiagnosis.) It appears that in this case potential misdiagnoses aren't just a theoretical problem.
This is what 23andMe said about that person's genome:
"Has two mutations linked to limb-girdle muscular dystrophy. A person with two of these mutations typically has limb-girdle muscular dystrophy."
Of course this not a diagnosis in a technical sense, but to a lot of people it will sound like it is. Specifically, I don't see how this is "very clearly" not a diagnosis.
23andMe empowers you to better manage your health and wellness.
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There are no disclaimers on this page, just an aphorism, an assertion, and a call to action. Now I like the idea of 23andme, I like the company, and I'm educated and skeptical enough to enjoy some fluffy scientism for a hundred bucks, but don't tell me they're not selling the hell out of this.
[1] http://www.ctrl-verlust.net/23andme-wie-ich-fur-todkrank-erk...