The wiki just likes to make the details available. Installation of nextcloud is as easy as pacman -S nextcloud
You’re comparing a simple install guide with the entire detailed documentation of a package. of course the package docs are going to have more details.
Ignoring details is not the same as being user friendly. Having a bunch of corpo marketing pictures of slightly above average people smiling on video chat in your installation docs does not make something user friendly. Is this really the metric we are going by, how little information is in the documentation?