I have personally experienced letsencrypt auto renewal failures. And I know other people on whose hobbyist servers it has failed too. I don't remember how it h

I have personally experienced letsencrypt auto renewal failures. And I know other people on whose hobbyist servers it has failed too. I don't remember how it happened - maybe it was user error, but even so it only manifested 3 months after set up, which is not always the most convenient time. And then it's 3 more months to see if the fix truly worked.