In my experience, there are 10x programmers (just like there are 10x musicians and 10x doctors and 10x pretty much everything). Of course, a 10x functional developer isn't inherently a 10x OOP developer, just like a 10x trumpeter isn't inherently a 10x drummer.
I don't think we need to kill the 10x developer myth, but that _all_ we need are 10x developers.
I think a much more interesting discussion would be what a really good 1x developer would look like. I.e., what is a good baseline? How do we nurture more people to reach for competency? And in growing the overall talent pool, identify the 5x, 10x, or even 100x developers.