I think it's safe to say that Judge Posner hasn't been particularly fond of the Bluebook for quite some time (he called the 16th edition a "grotesque 255 pages long"), and that is especially true for the new 511-page 19th edition. Here are a few choice quotes from his review of the 19th edition in Yale Law Review:
The Bluebook: A Uniform System of Citation exemplifies hypertrophy in the
anthropological sense. It is a monstrous growth, remote from the functional
need for legal citation forms, that serves obscure needs of the legal culture and
its student subculture.
[N]eedless to say, I have not read the nineteenth edition. I have dipped into it, much as one might dip one’s toes in a pail of freezing water. I am put in mind of Mr. Kurtz’s dying words in Heart of Darkness — ‘The horror! The horror!’ — and am tempted to end there.
The basic rule of abbreviating, ignored by the authors of The Bluebook, is to avoid nonobvious abbreviations: don’t make the reader puzzle over an abbreviation, as The Bluebook does routinely. . . . It’s as if there were a heavy tax on letters, making it costly to write out Coast Guard Court of Criminal Appeals instead of abbreviating it “C.G. Ct. Crim. App.”
I imagine Judge Posner would have similar harsh words for ALWD, which has now grown to a monstrous and unwieldy 661 pages.