While we ended up having several core maintainers use BitKeeper - it was free to use for open source projects - it never got ubiquitous. So it helped kernel development, but there were still pain points.
Linus TorvaldsIf you have ever done any security work - and it did not involve the concept of "network of trust" - it wasn't security work, it was - masturbation. I don't know what you were doing. But trust me, it's the only way you can do security, it's the only way you can do development.
Linus Torvalds