Exactly. There's also the case when someone is highly productive but only for themselves. They create all their own tools, their own environments, their own platforms, they follow their own homemade software development practices, use their own testing tools, and none of it integrates with the rest of the world. But, because one person made everything, that single person is super productive (as long as they never step outside their own platform). They don't need documentation because they made everything from the ground up and their systems reflect their personal brain state.
Then you have to ask, even though one person is 10x, does it really help if nobody else can integrate with their work? Then every request, feature, bug fix is a bottle neck of 1 person no matter how much outside help you give them.
Your link also relates a lot to social platform evaporation: http://blog.bumblebeelabs.com/social-software-sundays-2-the-... — all the good people leave because too many mediocre people become a burden. Now you're left with a platform for ants.