Quite a few people have had issues trying to get a Lemmy instance setup, and in a lot of cases it seems to be an issue with the documentation missing something or not being super clear (not blaming the devs btw, they have a LOT on their plate these days).
With the influx of users that are going to be coming to Lemmy over the next while, being able to get new instances setup is going to be critical, so anything that could improve the installation documentation, the Docker and Ansible examples, etc., which in turn will also reduce the number of installation support requests the Lemmy devs get, would be a huge help.
The documentation was put together by people that have a detailed knowledge of things and have lots of technical experiencr. I have a feeling that if some things are missing, it’s probably because they assume that someone setting this up already had a certain level of experience and therefore would already know what to do. More than likely they didn’t feel that every tiny step was needed as there would be a certain amount of common knowledge already.