It's still not very useful to hide the length. If you don't know the length and just start guessing with passwords of length 0 it only adds about 1/N extra guesses where N is the alphabet size compared to guessing strictly the right length. So it is a very small savings to know the password length.

It might matter a bit more for dictionary-based attacks (you don't have to bother hashing dictionary permutations that don't match the expected length) but I still suspect it doesn't save you much.