What are you talking about? My nginx ssl config is static as well. It looks at a specific path for my certs, which just happens to be a symlink managed my by letsencrypt tooling.

You're going to have to renew anyway. Previously you would have to remember to do that once a year, or maybe once every two years. Now let's ignore the security implications of having certificates that are valid for a year for a moment, and just focus on the actual work. Every year, you have to request a new certificate, wait for your certificate authority, upload the new certificate to the server, reload your webserver, check if everything works.

With LE, you do all of that once. You set up the tooling and the cronjob once. You make sure it works once. And you're done. No more hassle.