I think it's more that the "10x programmer" myth has caused a lot of pain and bullshit.

There are startup CEO's who won't settle for anything less than a "10x programmer" and waste everyone's time trying to find one.

There are narcissistic coders who think they're "10x" and therefore can act like spoiled children to everyone around them.

If I hear "10x programmer" in anything other than "...is a myth" then it's a sign that whoever is speaking is probably someone I don't want to work with.