[another-acct]

> For me, GitHub PR review drives me crazy. It's good for exactly one round of exchange. After that nobody can tell what the heck is going on.

Matches my experience totally. It devolves into a heap of garbage. In comparison, with (incremental) mailing list-based review, it's not difficult to go up to v7 or so.

> But on non-subjective metrics it seems like LLVM PRs on GitHub are gathering noticeably less discussion than they used to enjoy as Phabricator diffs.

That could be a consequence of GitHub making it harder to comment sensibly.