The point is that the developers of git don't use any bug tracker. It doesn't matter how much bug tracking software is available if they refuse to use it. Honestly I'm not surprised; I don't think Linus uses any of the Linux bug trackers either.
Ah. I got the impression that people were complaining that the rest of us can't leverage existing tools.
Git's simplicity and pile-of-tools approach, along with daily use of the tool and prodigious debug output, strike me as exactly the sorts of things that minimize the need for bug tracking. If there's a bug in my own statistical code, for example, I usually know about it from the debug output. If that works for the Git developers, fucking awesome.
However, just because Linus doesn't use a bug tracker, doesn't mean that the big shops (RedHat for example) don't pick up the slack. I think Linus is a flawed example ;-)