I might not be fully understanding the idea, but the difference here is that a let's encrypt certificate can be generated on the fly. domains are considered bra

I might not be fully understanding the idea, but the difference here is that a let's encrypt certificate can be generated on the fly. domains are considered branding, and getting a 5 letter domain nowadays is impossible. The cost here is that you're renting a domain that others might want aswell, people don't really want your LE cert