Why kernel development still uses email

Huh. I haven't worked with Gerrit, so I can't offer an opinion one way or the other, but LibreOffice seems to be using it fairly successfully. They're not quite on the scale of the kernel team, but it's a pretty good-sized project with a pretty decent number of developers. They seem to deal with a reasonably high volume of patches, so submission can't be *that* hard. Can it? Do they have some secret that makes it work better? Or are they all a bunch of masochists? (Including their many drive-by contributors?)

I'm generally happy with an email workflow myself, since it's what I'm used to, but I'm really rather surprised to hear Greg say such things about what appears, from the outside, to be part of the secret to LO's success.