Wikimedia's code review process relies on Gerrit, but we are starting to do steps to move it to Phabricator. Currently our official process goes through git-review, but contributors can use plain Git as well.
Is it technically possible to mirror this situation in Phabricator, having an official process that goes through Arc, but allowing users to use plain Git to contribute patches? If so, are you interested in developing this feature or to support it if someone else develops it? We would like to offer to our contributors the features that Gerrit supports and allows today.
In fact, there is a way to bypass Arc, but you're expected to 'git diff' and copy/paste that in the web UI. This is really inconvenient. And then you'll loose commit metadata that way. Like committer, author, and most important: parent of a commit.
This request was originally filed at https://phabricator.wikimedia.org/T127, where you can also find an entertaining discussion, :)