Getting cold emails from random HN'ers is so rare that I don't list an email because of that. (I experimented with emails in my bio on other accounts and can tell you for certain: people rarely reach out, if at all). I chat privately with a close cadre of friends that I have organically grown over years and I'm happy with my lot. Making friends with random HN'ers is not one of my goals on here. Besides, we can solve problems on HN itself and keep things out of email.