OK, our perspectives differ. What about being blacklisted by e-mail servers? Gmail, Hotmail, Yahoo and others may start considering the domain name as spam, then the legit and good e-mails won’t get through? Registration and lost password emails for the innocent folk.
This is potentially damaging to my domain name which is quite difficult, if not impossible, to undo. This is more than just a nuisance. If there’s no way to disable it, it should be tabled to WP core developers to address.