It seems like pred would also work in the last couple examples where you've recommended selected?. What are some instances where they would behave differently?

well, for pred to work like (selected? (must :a) (must :b)) you would have to write #(and (contains? % :a) (contains? (:a %) :b))

@puzzler selected? is particularly good for things like (selected? (filterer even?) (view count) #(>= % 2)), which stays navigated at current position if the sequence contains at least 2 even numbers

or something like (selected? ALL even?) which stays navigated if at least one even number

It sounds like, basically, pred takes a Clojure predicate function and selected? takes a navigator path.

@puzzler yes, that's correct