Workflow is as much about people and process as it is about tools. The tools simply serve the people and processes.
This is a project that has consistently hit high quality releases, on a predetermined schedule, for coming up on two decades. That is unprecedented. I can't think of anything even remotely similar.
Version control is a tool for integrating change and managing releases. They are arguably one of the best projects at doing it. See the silliness of the "CVS?!" non sequitur yet?
So for people to drive by, who are statistically more likely part of the problems in the software industry, and critique the OpenBSD development process.. is at best cute and worst delusional.
Inadvertently(?) it functions as a litmus test.. if you care so much about this, you aren't really who we want to work with anyway, similar to the candidate fixated on his title in http://dtrace.org/blogs/eschrock/2012/08/14/engineer-anti-pa...