Further, there is always the domain-specific knowledge that walks out the door. We can read source code and eventually understand it, but the reasons behind th

Further, there is always the domain-specific knowledge that walks out the door. We can read source code and eventually understand it, but the reasons behind the algorithms might be the result of years of experience in the domain. That's not easy to replace quickly. The core team at my employer has been together for two and half years, and four members of the seven person team have been together since day one.