It makes sense to change credentials periodically, but the policy of 30 days for humans doesn't work because the humans aren't realistically going to remember new credentials every 30 days.
If you have Let's Encrypt, the default setup (Certbot) will change the key every time it renews, typically 60 days, but you aren't expected to remember the key it's just data for a machine to store somewhere, so there's no practical problem and it defuses some risks (e.g. bad guys get hold of old backups). So the idea of rotating credentials like this would make sense _if humans weren't expected to remember them_.
It makes sense to change credentials periodically, but the policy of 30 days for humans doesn't work because the humans aren't realistically going to remember new credentials every 30 days.
If you have Let's Encrypt, the default setup (Certbot) will change the key every time it renews, typically 60 days, but you aren't expected to remember the key it's just data for a machine to store somewhere, so there's no practical problem and it defuses some risks (e.g. bad guys get hold of old backups). So the idea of rotating credentials like this would make sense _if humans weren't expected to remember them_.