I get what you mean - i would say that not everyone has a devops team and is setting up a whole bunch of infrastructure. I would rather recommend a ssl certificate baked into a docker image (stored in a private registry) versus no https at all
even if you use a secrets management tool, there are very few (probably none) that can bootstrap a Letsencrypt api. So this new one makes that possible as well.
Using nginx and a let's encrypt client on the host, the certificates are only generated and kept inside the machine itself. That's safer than baking them into the Docker image, which will be copied around.