Peeve: Programs that can only parse options in certain orders and not in other orders.

I'm looking at you git log foo --stat, and at you gpg --recv-key foo --keyserver=bar

Hmm, that's another nice thing about optparse-applicative. Applicatives fundamentally don't impose an order of operations (this is what distinguishes them from monads), and so option parsers built using it cannot have this bug.