Comment by pevey

I used to think info about whether an account exists should not be leaked in the password reset flow, and I designed sites this way, but then someone pointed out that in practice a hacker would then just move to the account sign up flow to check for the existence of an account. (If account exists, you cannot make another with that email on most sites.) I never had a good response for that. I now lean toward the idea that not providing info is just not worth the bad UX.