Comment by hananova

Any password of a length that could feasibly be cracked by way of brute force (So up to perhaps 8?) would only save 1/N of the total time taken to crack it with N being the length if one were to know the exact length.

So yes, sure, technically there is an effect, but it's such a small effect, and only for people that should change their damn passwords already, that it's worth making the change for the improved UX.