I'm an open source developer and I have absolutely no desire to switch to OSX. I don't really spend much time fiddling with my setup and I probably gain a lot of productivity by having an environment that is completely customized to my workflow.

Personally I'm running Arch w/ stumpwm on vanilla X. All I need is emacs, ff, and a couple terminal windows. No distractions at all; no windows hiding other windows, no tabbing through three or four windows to get to the one I want, nothing popping up in my face, no bloat-ware monitoring useless information. My fingers almost never leave my home row while I work.

I don't really know what this article was trying to get at. I'm sure there are lots of developers who do use OS X, but I don't think that choice really has much to say about open source developers as a whole and probably less to say about developers who do not switch.

It's just an operating system.