Documentation is always outdated and useless. GNOME is crap. apt has a dependency issue every week. Repos have software ranging from bleeding edge to horrendously outdated. Netplan is next level stupid and also decides to break for no reason. Systemd waits for network to boot by default because reasons. Versioning and LTS adds more magic fun to doing anything because of the aforementioned documentation. Last time I used it, still had crap interoperability when switching DEs for some weird reason. Canonical is the big dumb dumb. All the downstreams inherit the same problems like PopOS and elementary.
I took all of that experience and thought it was the default linux expectations until I got to try Debian for server and Fedora for desktop.
Unfortunately, people make the same mistake as me and then assume broken Ubuntu is just how linux is.
Credit though, it did get to teach me the general ins and outs of linux because I needed to fix or change something every other week.