> Some developers fear fungability, they think that that one system only they know is job security. I see it the other way, I see that as a technical risk, but

> Some developers fear fungability, they think that that one system only they know is job security. I see it the other way, I see that as a technical risk, but also a thing that might be keeping a great engineer from working on more important projects. Or the way to work on something else when you get fed up with that one system you hate. I don't fear fungibility - if a place doesn't want me there I don't want to be there either. I dislike idea of fungibility because it creates huge overhead and avoids using talented people to full potential - because they are not fungible. In some places that's warranted - but in others - the process overhead is far greater risk to your project success than bus factor.