That's just one of the many pieces of the puzzle. Most people don't understand how certificates work and get themselves in all sorts of trouble, so part of the

That's just one of the many pieces of the puzzle. Most people don't understand how certificates work and get themselves in all sorts of trouble, so part of the problem is technical and educational. "Let's Encrypt" is much more than just a certificate authority, in fact other CAs can adopt Let's encrypt protocol (ACME). ACME is arguably solving the bigger part of the problem which is automatic configuration and renewal for the vast majority of people who have no clue how any of this works and don't want to have to think about it.