Like you, I was saved by this once. I had a certificate with multiple domain names [1], and decided not to renew one of the domains. That caused the certificate

Like you, I was saved by this once. I had a certificate with multiple domain names [1], and decided not to renew one of the domains. That caused the certificate renewal to fail, even though I was still serving content on the other domains. The email alerted me to this - and that alone made it worth it for me, even with all the noise. But I can understand LE's position, especially since there are other options for setting up free certificate monitoring. [1] I didn't even realize I was doing this - it's just how certbot set things up based on my nginx configuration.