... is that LF, so called, is simply the Utility Group of the literary kennel club. Meaning that if these disparate dogs have no obvious utility, you put 'em there. (To paraphrase Fluellen, both are where you shove the poodles.)

It's actually quite a useful analogy. Heyer? Gundog. Ford? Working Group. Rankin? Hound. Barbara Pym? Pastoral. Milne? Toy. Tom Sharpe? Terrier. And so on.