When I see that there was a breach which may have included my personal data and it is suggested I change my passwords at all sites using my associated email, wondering if we can see what sites may have used the email (or username). I can't remember all websites where I registered the same email over the past 30 years!
I second this and would like to elaborate on it. When a data breach is found for that email, I would want to know specifically which website the breached login pertains to. I have several hundred logins from over a couple of decades, and it would not be feasible for me to change every single password that uses that email.