I don't know if it is a valid argument or not, but according to Bazaar docs it's one of Bazaar's strong points. AFAIK the official Lanuchpad FAQ says Bazaar is

I don't know if it is a valid argument or not, but according to Bazaar docs it's one of Bazaar's strong points. AFAIK the official Lanuchpad FAQ says Bazaar is the best VCS for the project: https://answers.launchpad.net/launchpad/+faq/37 https://answers.launchpad.net/launchpad/+faq/37 And apparently they can (or want to) support only one. Fair enough.