on the systems where i had to do this for my account i usually get a message like: "an email has been sent to the address registered with this account"
The benefit is that people often don't remember which email they used for a service. They check their "main" email inbox but don't remember that they used their student email address 8 years ago when they signed up. By providing a hint they know which inbox to check and don't get frustrated because the email isn't coming.
So it is a privacy tradeoff for better UX. If it is a good tradeoff will depend on how much you value each.
I have many email addresses. I don't necessarily know which email address is associated with my account. Therefore, the user benefits from knowing which email inbox they should check.
That said, it could be that the security risk outweighs that convenience.
So it is a privacy tradeoff for better UX. If it is a good tradeoff will depend on how much you value each.